wayground logo

Free Printable Worksheets

Font size

S
M
L
XL
Worksheets

DUAL NATURE

Total questions: 112

Worksheet time: 1hrs 14mins

Name
Class
Date
1.

Photoelectric effect phenomenon was discovered by:

a)

Newton

b)

Maxwell

c)

Hertz

d)

Huygens

2.

Hallwachs experiment set-up is used to study:

a)

Tyndal effect

b)

Diffraction of light

c)

Photo electric effect

d)

Raman effect

3.

Photoelectric current is ………. proportional to the number of photoelectrons emitted per second.

a)

inversely

b)

directly

c)

first directly and then inversely

d)

none of these

4.

The stopping potential depends upon the ....……….. of the fastest electron.

a)

velocity

b)

charge

c)

mass

d)

density

5.

For a given frequency of the incident radiation, the stopping potential …..…….... of its intensity.

a)

is directly proportional

b)

is inversely proportional

c)

is independent

d)

None of these

6.

Photoelectric emission is a/an …………………. process.

a)

slow

b)

fast

c)

instantaneous

d)

very slow

7.

The maximum kinetic energy of the photoelectrons is ….......... proportional to the frequency of incident radiation.

a)

inversely

b)

directly

c)

first directly and then inversely

d)

none of these

8.

According to the quantum theory, light is emitted in the form discrete bundles of energy called ……………..

a)

waves

b)

corpuscles

c)

photons

d)

mesons

9.

The energy spent in releasing the photoelectrons from a metal surface is called ……………

a)

kinetic energy

b)

potential energy

c)

work function

d)

excitation energy

10.

A photon of frequency ν is incident on a metal surface of threshold frequency νο. The kinetic energy of the emitted photoelectron is:

a)

h (𝜈– 𝜈ο )

b)

h𝜈

c)

h𝜈ο

d)

h (𝜈 + 𝜈ο )

11.

Assertion: The relative velocity of two photons travelling in opposite direction is the velocity of light.


Reason: The rest mass of a photon is zero.

a)

both Assertion and Reason are true and the Reason is correct explanation of the Assertion.

b)

both Assertion and Reason are true, but the Reason is not a correct explanation of the Assertion.

c)

Assertion is true and Reason is false.

d)

both, Assertion and Reason are false.

12.

Assertion : Photo-emission from a photosensitive surface is possible only if the incident radiation has a frequency above threshold frequency.


Reason: Unless, the energy of incident photon is greater than the work function of photo-sensitive surface no photo-emission is possible.

a)

both Assertion and Reason are true and the Reason is correct explanation of the Assertion.

b)

both Assertion and Reason are true, but the Reason is not a correct explanation of the Assertion.

c)

Assertion is true and Reason is false.

d)

both, Assertion and Reason are false.

13.

Assertion : An electron microscope can achieve better resolving power than an optical microscope.


Reason: The de-Broglie wavelength of the electrons

emitted from an electron gun with velocity 500 m/s is much less than 500 nm.

a)

both Assertion and Reason are true and the Reason is correct explanation of the Assertion.

b)

both Assertion and Reason are true, but the Reason is not a correct explanation of the Assertion.

c)

Assertion is true and Reason is false.

d)

both, Assertion and Reason are false.

14.

Assertion: If we consider electrons and photons of the same wavelength, they will have the same momentum.


Reason: Electrons and photons have the same energy.

a)

both Assertion and Reason are true and the Reason is correct explanation of the Assertion.

b)

both Assertion and Reason are true, but the Reason is not a correct explanation of the Assertion.

c)

Assertion is true and Reason is false.

d)

both, Assertion and Reason are false.

15.

Assertion : A proton is about 1840 times heavier than an electron. When it is accelerated by a potential difference of 1 kV, its kinetic energy is 1 keV.


Reason: Gain in kinetic energy = charge x potential difference.

a)

both Assertion and Reason are true and the Reason is correct explanation of the Assertion.

b)

both Assertion and Reason are true, but the Reason is not a correct explanation of the Assertion.

c)

Assertion is true and Reason is false.

d)

both, Assertion and Reason are false.

16.

Assertion : Light of frequency 1.5 times the threshold frequency is incident on photo-sensitive material. If the frequency is halved and intensity is doubled, the photo current remains unchanged.


Reason: The photo electric current varies directly with the intensity of light and frequency of light.

a)

both Assertion and Reason are true and the Reason is correct explanation of the Assertion.

b)

both Assertion and Reason are true, but the Reason is not a correct explanation of the Assertion.

c)

Assertion is true and Reason is false.

d)

both, Assertion and Reason are false.

17.

Assertion. Photoelectric effect demonstrates the wave nature of light.


Reason. The number of photoelectrons is proportional

to the frequency of light.

a)

both Assertion and Reason are true and the Reason is correct explanation of the Assertion.

b)

both Assertion and Reason are true, but the Reason is not a correct explanation of the Assertion.

c)

Assertion is true and Reason is false.

d)

both, Assertion and Reason are false.

18.

Assertion. Photocell is called electric eye.

Reason. Photocell can see the things placed before it.

a)

both Assertion and Reason are true and the Reason is correct explanation of the Assertion.

b)

both Assertion and Reason are true, but the Reason is not a correct explanation of the Assertion.

c)

Assertion is true and Reason is false.

d)

both, Assertion and Reason are false.

19.

Assertion. The de-Broglie wavelength of a neutron is X when its kinetic energy is k is . Its wavelength is 2x when its kinetic energy is 4 k.


Reason. The de-Broglie wavelength is proportional to square root of the kinetic energy.

a)

both Assertion and Reason are true and the Reason is correct explanation of the Assertion.

b)

both Assertion and Reason are true, but the Reason is not a correct explanation of the Assertion.

c)

Assertion is true and Reason is false.

d)

both, Assertion and Reason are false.

20.

Assertion. The de-Broglie wavelength equation has significance for any microscopic or sub microscopic particles.


Reason. The de-Broglie wavelength is inversely proportional to the

mass of the object if velocity is constant

a)

both Assertion and Reason are true and the Reason is correct explanation of the Assertion.

b)

both Assertion and Reason are true, but the Reason is not a correct explanation of the Assertion.

c)

Assertion is true and Reason is false.

d)

both, Assertion and Reason are false.

21.

Statement-1:

A laser beam of 0.2 W can drill holes through a metal sheet whereas a 1000 W light cannot.

Statement-2 :

The frequency of laser light is much higher than that of torch light.

a)

Statement-1 is true ; Statement-2 is true ; Statement-2 is a correct explanation of Statement-1.

b)

Statement-1 is true ; Statement-2 is true ; Statement-2 is not a correct explanation of Statement-1.

c)

Statement-1 is true ; Statement-2 is false.

d)

Statement-1 is false ; Statement-2 is true.

22.

Statement-1:

The kinetic energy of photo-electrons emitted by a photo-sensitive surface depends upon the frequency of the incident radiations.

Statement-2 :

The kinetic energy of the emitted photoelectrons changes only with a change in the frequency of the incident radiations.

a)

Statement-1 is true ; Statement-2 is true ; Statement-2 is a correct explanation of Statement-1.

b)

Statement-1 is true ; Statement-2 is true ; Statement-2 is not a correct explanation of Statement-1.

c)

Statement-1 is true ; Statement-2 is false.

d)

Statement-1 is false ; Statement-2 is true.

23.

.

a)

Statement-1 is true ; Statement-2 is true ; Statement-2 is a correct explanation of Statement-1.

b)

Statement-1 is true ; Statement-2 is true ; Statement-2 is not a correct explanation of Statement-1.

c)

Statement-1 is true ; Statement-2 is false.

d)

Statement-1 is false ; Statement-2 is true.

24.

Statement-1 :
 An electron of mass m when accelerated through a potential difference V, has de-Broglie wavelength . The de-Broglie wavelength associated with a proton of mass M accelerated through the same potential difference will be a  
Statement-2 :
 de-Broglie wavelength λ=\lambda=    h2meV\frac{h}{\sqrt{2meV}}  

a)

Statement-1 is true ; Statement-2 is true ; Statement-2 is a correct explanation of Statement-1.

b)

Statement-1 is true ; Statement-2 is true ; Statement-2 is not a correct explanation of Statement-1.

c)

Statement-1 is true ; Statement-2 is false.

d)

Statement-1 is false ; Statement-2 is true.

25.

Statement-1:

Work function of a metal is 2 eV. The maximum wavelength of photons required to emit electrons from its surface is 6200 A.

Statement-2:

Work function, Wo = hc/ max.

a)

Statement-1 is true ; Statement-2 is true ; Statement-2 is a correct explanation of Statement-1.

b)

Statement-1 is true ; Statement-2 is true ; Statement-2 is not a correct explanation of Statement-1.

c)

Statement-1 is true ; Statement-2 is false.

d)

Statement-1 is false ; Statement-2 is true.

26.

Statement-1:

Photoelectrons emitted from a metal surface have speeds varying from zero up to certain maximum value.

Statement-2 :

The work function of the metal goes on decreasing with the emission of electrons from it.

a)

Statement-1 is true ; Statement-2 is true ; Statement-2 is a correct explanation of Statement-1.

b)

Statement-1 is true ; Statement-2 is true ; Statement-2 is not a correct explanation of Statement-1.

c)

Statement-1 is true ; Statement-2 is false.

d)

Statement-1 is false ; Statement-2 is true.

27.

Statement-1 :

The photoelectric current in a photocell increases with the increase in wavelength of the incident radiation.

Statement-2:

The energy of the incident radiation increases with the increase in frequency of incident radiation.

a)

Statement-1 is true ; Statement-2 is true ; Statement-2 is a correct explanation of Statement-1.

b)

Statement-1 is true ; Statement-2 is true ; Statement-2 is not a correct explanation of Statement-1.

c)

Statement-1 is true ; Statement-2 is false.

d)

Statement-1 is false ; Statement-2 is true.

28.

Statement-1 :

The photoelectrons produced by a monochromatic light beam incident on a metal surface have a spread in their kinetic energies.

Statement-2:

The work function of the metal varies as a function of depth from the surface.

a)

Statement-1 is true ; Statement-2 is true ; Statement-2 is a correct explanation of Statement-1.

b)

Statement-1 is true ; Statement-2 is true ; Statement-2 is not a correct explanation of Statement-1.

c)

Statement-1 is true ; Statement-2 is false.

d)

Statement-1 is false ; Statement-2 is true.

29.

Statement-1:

A small metal ball is suspended in a uniform electric field with an insulated thread. If high energy X-rays beam falls on the ball, the ball will be deflected in the electric field.

Statement-2:

X-rays emit photoelectrons and metal becomes negatively charged.

a)

Statement-1 is true ; Statement-2 is true ; Statement-2 is a correct explanation of Statement-1.

b)

Statement-1 is true ; Statement-2 is true ; Statement-2 is not a correct explanation of Statement-1.

c)

Statement-1 is true ; Statement-2 is false.

d)

Statement-1 is false ; Statement-2 is true.

30.

When a surface 1 cm thick is illuminated with light of wavelength , the stopping potential is Vo. But when the same surface is illuminated by light of wavelength 3 λ , the stopping potential is Vo/6. The threshold wavelength for surface is 4 λ.

a)

True

b)

False

31.

The mercury line of wavelength 2536 Å is used to eject photoelectrons from silver metal. The difference in potential required to bring all the ejected electrons to rest is 0.11 volt. The energy necessary to remove an electron from silver metal is 4.77 eV. Given hc = 12400eV Å.

a)

True

b)

False

32.

. Energy from sun is received on earth at the rate of 2 calories per cm2 per minute. If average wavelength of solar light be taken at 5500 Å, then the number of photons received on the earth per cm2 per minute are 3 x 1019 [use,h = 6.6 x 10-34 Js ; 1 calories = 4.2 J]

a)

True

b)

False

33.

An X-ray tube operates at 10kV, The ratio of X-ray wavelength to that of de-Broglie wavelength is nearly 10 .

a)

True

b)

False

34.

Given , Boltzman constant = 1.38 x 10-23 J molecule-1 K-1 , h = 6.63 x 10-34 Js, mass of neutron = 1.66 x 10-27 kg. The de-Broglie wavelength of neutron at 27’ C is 2.46 Å.

a)

True

b)

False

35.

Two metals X and Y have work function 2 eV and 5 eV respectively . when these metals are irradiated with light of wavelength 400nm, the emission of photoelectron will take place from metal Y only and not from metal X. [use hc = 1240 eV nm]

a)

True

b)

False

36.

X-ray of wavelength λ fall on a photosensitive surface , emitting photoelectrons. Neglecting the work function of the surface , the de-Broglie wavelength of emitted photoelectron will be √hλ/mc.

a)

True

b)

False

37.

100W light bulb is placed at the centre of a spherical chamber of radius 0.10 m . Assume that 75.36 % of the energy supplied to the bulb is converted into light and that the surface of chamber is perfectly absorbing . the pressure exerted by the light on the syrface of the chamber is 6.5 x 10-7 pa.

a)

True

b)

False

38.

The light photons of energy 1 eV and 3 eV respectively are made incident on a metallic plate of work function 0.5 eV one after the other. The ratio of maximum kinetic energy of photoelectron emitted by them is 1 : 5.

a)

True

b)

False

39.

If the wavelength of incident light changes from 4400Å to 4000Å , then change in stopping potential is -0.28 V. [ use hc = 12400 eV Å].

a)

True

b)

False

40.

1 The minimum energy required by an electron to just eject from the metal surface so as to overcome the restraining forces at the surface is called ……………..

(a)  

41.

2. The phenomenon of photoelectric emission was discovered by ……..

(a)  

42.

3. The maximum kinetic energy of emitted photoelectrons depends on the ………..and nature of …………but is independent of………..

(a)  

43.

4. The ratio of number of photoelectron ejected to the number of the photons falling on a metal surface is ….. than ………..

(a)  

44.

5. Photon is not a ………but it is a ………..

(a)  

45.

6. The velocity of photon in different media is………..

(a)  

46.

7. The intensity of light depends upon the… (a)   …present in light.

47.

8. The momentum of a photon of energy E is………. and of wavelength is……

(a)  

48.

9. The de-Broglie wavelength of a photon of an electromagnetic radiation is …………

(a)  

49.

10. A photon and electron have got same de-Broglie wavelength . Total energy of an electron is…….than that of photon .

(a)  

50.

11. For a given photosensitive material, the photoelectric current is ……….on decreasing the wavelength of incident radiation , without any change in intensity of radiation .

(a)  

51.

12. The expression for de-Broglie wavelength of an electron moving under a potential difference of V volt is……………



(a)  

52.

13. de-Broglie waves are associated with a moving particle irrespective of ………on it.

(a)  

53.

14. The main aim of Davission –Germer experiment is to verify…….

(a)  

54.

15. An increase in the frequency of the incident light ……….the velocity with which photoelectron is ejected.

(a)  

55.

Two photons, each of energy 2.5 eV are simultaneously incident on sodium metal surface the work function of sodium is 2.75 eV, then from its surface __________ will be emitted.

a)

one electron

b)

two electrons

c)

more than two electrons

d)

not a single electron

56.

1 eV is equal to _______

a)

1.602 × 1019  J1.602\ \times\ 10^{19\ }\ J

b)

1.602 × 10−19  J1.602\ \times\ 10^{-19\ }\ J

c)

1.602 × 10−29  J1.602\ \times\ 10^{-29\ }\ J

d)

1.602 × 1029  J1.602\ \times\ 10^{29\ }\ J

57.

When the intensity of a light source is increased

a)

the number of photons emitted by the source in unit time increases

b)

more energetic photons are emitted

c)

faster photons are emitted

d)

total energy of the photons emitted per unit time decreases

58.

The photo current in an experiment on photoelectric effect increases if

a)

the intensity of the source is increased

b)

the exposure time is increased

c)

the intensity of the source is decreased

d)

the exposure time is decreased

59.

As the intensity of incident light increases, the

a)

K.E of emitted photo electrons increases

b)

photoelectric current decreases

c)

photoelectric current increases

d)

K.E of emitted photo electrons decreases

60.

The value of stopping potential when the frequency of light is equal to the threshold frequency is

a)

maximum

b)

zero

c)

minimum

d)

infinity

61.

Light exhibits ______ duality

a)

particle-wave

b)

solid-liquid

c)

liquid-gas

d)

gas-plasma

62.

The phenomenon by which metals emit electrons under the influence of radiation is called ____

a)

photoelectric effect

b)

interference

c)

polarization

d)

ionization

63.

Photoelectric effect was first discovered by

a)

Einstein

b)

Newton

c)

Hertz

d)

Germer

64.

At the stopping potential, photoelectric current is _______-

a)

maximum

b)

a constant

c)

zero

d)

infinity

65.

If the kinetic energy of photo electron is found to be 16 J, whose mass is mem_e , the maximum velocity of that electron will be______

a)

2me4\sqrt[4]{\frac{2}{m_e}}

b)

4me\sqrt[]{4m_e}

c)

42me\sqrt[]{\frac{4}{2m_e}}

d)

1me2\sqrt[2]{\frac{1}{m_e}}

66.

The saturation current is proportional to the ______ of radiation

a)

intensity

b)

time of travel

c)

target material

d)

frequency

67.

For frequency v3 >v2 >v1v_{3\ }>v_{2\ }>v_1 , the corresponding stopping voltages are in the order

a)

(V0)1>(V0)2 >(V0)3\left(V_0\right)_1>\left(V_0\right)_{2\ }>\left(V_0\right)_3

b)

(V0)2>(V0)1 >(V0)3\left(V_0\right)_2>\left(V_0\right)_{1\ }>\left(V_0\right)_3

c)

(V0)3>(V0)2 >(V0)1\left(V_0\right)_3>\left(V_0\right)_{2\ }>\left(V_0\right)_1

d)

(V0)1>(V0)3 >(V0)2\left(V_0\right)_1>\left(V_0\right)_{3\ }>\left(V_0\right)_2

68.

The frequency of the incident radiation below which the photo electric emission is not possible completely is known as ______ frequency

a)

stopping

b)

zero-level

c)

threshold

d)

highest

69.

Below the threshold frequency, if the intensity of radiation is increased, the emission of photoelectrons _____

a)

increases

b)

decreases

c)

zero

d)

constant

70.

The light photon has ____ nature

a)

wave

b)

particle

c)

matter

d)

dual

71.

The photon behaves as a particle in ________ phenomenon

a)

emission

b)

diffraction

c)

polarization

d)

interference

72.

The energy spent in releasing a photoelectron is called photoelectric _____ of the metal

a)

energy

b)

ionization potential

c)

work function

d)

absorption energy

73.

The minimum amount of energy required to liberate a photo electron from the metal surface is called as ________

a)

cut off energy

b)

work function

c)

threshold frequency

d)

potential energy

74.

The cathode is coated with a material of low work function because

a)

a large number of photo electron can be got

b)

high work function should be achieved later

c)

it is transparent

d)

it is low in cost

75.

The alphabet "h" represent ____ constant

a)

Planck's constant

b)

Boltzman

c)

Einstein

d)

gravitational

76.

The value of Planck's constant is _______

a)

6.62 × 10−34 Js6.62\ \times\ 10^{-34}\ Js

b)

6.62 × 1034 Js6.62\ \times\ 10^{34}\ Js

c)

6.62 × 10−45 Js6.62\ \times\ 10^{-45}\ Js

d)

6.62 × 1045 Js6.62\ \times\ 10^{45}\ Js

77.

Mass of an electron in gram_____

a)

9.11 × 10−319.11\ \times\ 10^{-31}

b)

9.11 × 10−289.11\ \times\ 10^{-28}

c)

9.11 × 10−339.11\ \times\ 10^{-33}

d)

9.11 × 10−309.11\ \times\ 10^{-30}

78.

1 joule = eV

a)

1.6× 10181.6\times\ 10^{18}

b)

11.6× 1019\frac{1}{1.6\times\ 10^{19}}

c)

10191.6\frac{10^{19}}{1.6}

d)

10−19 1.6\frac{10^{-19\ }}{1.6}

79.

Work function of a metal is the

a)

energy required by an electron to escape from the metal surface

b)

minimum energy required by an electron to escape from the metal surface

c)

energy required by an electron to get absorbed in the metal surface

d)

maximum energy required by an electron to escape from the metal surface

80.

In Which case is electron emission form a metal not known?

a)

heating the metal sufficiently

b)

Applying a very strong magnetic field to metal

c)

illuminating a metal surface with suitable light

d)

none of these

81.

Photoelectric effect is

a)

emission of electrons by insulators when illuminated by light of suitable frequency

b)

emission of electrons by metals when heated

c)

emission of electrons by glass when illuminated by light of suitable frequency

d)

emission of electrons by metals when illuminated by light of suitable frequency

82.

Photoelectric effect is possible

a)

with only ultraviolet

b)

with only visible

c)

with only white light

d)

with both visible and UV depending on the metal

83.

In photoelectric effect

a)

electrical energy its converted into light energy

b)

electric energy is converted into magnetic field

c)

light energy is converted into electric energy

d)

electric energy is converted into heat

84.

In various experiments on photo electricity the stopping potential for a given frequency of the incident light

a)

is inversely proportional to the radiation intensity

b)

is independent of radiation intensity

c)

is incident of the radiation intensity

d)

is proportional to radiation intensity

85.

In various experiments on photo electricity dealing with the stopping potential dependence on frequency of incident radiation the conclusion was that stopping potential

a)

depends on the light intensity

b)

is independent of frequency

c)

depends on the initial current

d)

depends on the frequency

86.

In photo electric effect, the K.E of electrons emitted from the metal surface depends upon

a)

intensity of light

b)

frequency of incident light

c)

velocity of incident light

d)

both intensity and velocity of light

87.

The collector plate in an experiment on photoelectric effect is kept vertically above the emitter plate, light source is put on and a saturation photoelectric current is recorded. An electric field is switched on which has a vertically downward direction

a)

the stopping potential will decreases

b)

the threshold frequency will increase

c)

the photoelectric current will increases

d)

the kinetic energy of the electron will increases

88.

In the above experimental setup for studying photoelectric effect if keeping the frequency of the incident radiation and the accelerating potential fixed, the intensity of light is varied

a)

photocurrent decreases linearly with intensityy

b)

photocurrent increases linearly with intensity

c)

photocurrent remains same with intensity

d)

photocurrent decreases non linearly with intensity

89.

The work function value of molybdenum is

a)

2.14

b)

5.65

c)

4.17

d)

4.28

90.

What did Max Planck tell about light?

a)

Light travels in the form of small packets of energy called photons.

b)

Light travels in the form of small packets of energy called quanta.

c)

Light travels in the form of electromagnetic radiation.

d)

Light is made up of tiny particles called corpuscles.

91.

Multiple answers can be correct: Energy of light is proportional to:

a)

Directly proportional to frequency

b)

Inversely proportional to wavelength.

c)

Directly proportional to speed of light.

d)

Independant of speed and wavelength

92.

Properties of photons are:

a)

It has perfectly elastic collision with everything that comes into its path.

b)

It transfers all its energy to the object it collides with.

c)

Every photon has energy proportional to its frequency.

d)

Energy of a photon in every medium is the same.

93.

The electrons that are emitted from a metal surface when light falls on the surface of the metal are called:

a)

Photon

b)

Electron

c)

Photoelectron

d)

Photon-electron pair

94.

The minimum required frequency required to remove an electron from an atom is called:

a)

Thershold frequency

b)

Critical frequency

c)

Infliction frequency

d)

None of the above

95.

To observe photoelectric current, the wavelength of photon should be:

a)

greater than threshold wavelength

b)

less than threshold wavelength

c)

equal to threshold wavelength

d)

any wavelength can create a photoelectric current

96.

More than one answer can be correct: Intensity of light is dependant on:

a)

Number of photon incident on unit area

b)

Energy of each individual photon incident

c)

Wavelength of photon

d)

None of these

97.

Work function is defined as:

a)

Maximum energy that an atom can with stand.

b)

Energy required to remove any electron from the atom.

c)

A function of work at nuclear level

d)

Energy required to remove the outrermost electron from the atom

98.

Stopping potential is:

a)

The minimum potential required to create a potential energy to stop even the most energetic photoelectron.

b)

The potential required to stop any photoelectron.

c)

The maximum potential required to contain a photoelectron

d)

None of these

99.

Who came up with the idea of matter waves?

a)

Compton

b)

Planck

c)

Maxwell

d)

De' Broglie

100.

According to de Broglie's hypothesis, the wavelength of a moving object is

a)

Proportional to the linear momentum of the object

b)

Inversely proportional to the linear momentum of the object

c)

Proportional to the angular momentum of the object

d)

Inversely proportional to the angular momentum of the object

101.

An electron, a proton, an alpha-particle and a hydrogen atom are moving with the same kinetic energy. The associated de Broglie wavelength will be longest for

a)

Electron

b)

Proton

c)

Alpha particle

d)

Hydrogen

102.

The theory, on the basis of Photoelectric effect can be explained

a)

corpuscular theory

b)

electromagnetic theory

c)

wave theory

d)

quantum theory

103.

electron volt is a unit of

a)

potential

b)

momentum

c)

energy

d)

charge

104.

A particle of light is called a...

a)

Photoelectron

b)

Photon

c)

Proton

d)

Electron

105.
This image is an illustration of
a)
photoelectric effect
b)
Dalton's atomic theory
c)
Bohr model
d)
Quantum mechanical model
106.
Which statement about the photoelectric effect is correct?
a)
Electrons are emitted instantaneously.
b)
Electrons are not emitted below a certain wavelength.
c)
You can change the energy of the electrons by changing the intensity.
d)
Electron energy is independent of frequency.
107.

That light has a dual nature is referring to light:

a)

having high- or low-energy photons.

b)

acting as waves and particles.

c)

having energy and momentum

d)

undergoing pair production.

108.

· All moving particles have a "matter wave" with a wavelength associated with them" This hypothesis has a name. Which?

a)

Davisson and Germer hypothesis

b)

De Broglie hypothesis

c)

Schrödinger hypothesis

d)

Bainbridge hypothesis

109.

The relation between photocurrent and intensity of light is:

a)
b)
c)
d)

NONE

110.

Photoelectric current is ………. proportional to the number of photoelectrons emitted per second.

a)

inversely

b)

directly

c)

first directly and then inversely

d)

none of these

111.

For a given frequency of the incident radiation, the stopping potential …..…….... of its intensity.

a)

is directly proportional

b)

is inversely proportional

c)

is independent

d)

None of these

112.

A photon of frequency ν is incident on a metal surface of threshold frequency νο. The kinetic energy of the emitted photoelectron is:

a)

h (𝜈– 𝜈ο )

b)

h𝜈

c)

h𝜈ο

d)

h (𝜈 + 𝜈ο )

Similar Resources on Wayground

Physics Test Review

107 questions

Physics Test Review

quiz

Worksheet

•

11th - 12th Grade

Physics B Final Review

113 questions

Physics B Final Review

quiz

Worksheet

•

9th - 12th Grade

Unit 5 - Energy

115 questions

Unit 5 - Energy

quiz

Worksheet

•

6th - 12th Grade

Test #1 Review

113 questions

Test #1 Review

quiz

Worksheet

•

10th - 12th Grade

Physical Science Unit 8- Energy

110 questions

Physical Science Unit 8- Energy

quiz

Worksheet

•

9th - 12th Grade

Semester 2 Final Review

108 questions

Semester 2 Final Review

quiz

Worksheet

•

9th - 12th Grade

Massive 9.3 Quizizz with Max and Kai (but no Joe or Florence)

108 questions

Massive 9.3 Quizizz with Max and Kai (but no Joe or Florence)

quiz

Worksheet

•

9th - 12th Grade

Phys U1 - Topic 2

117 questions

Phys U1 - Topic 2

quiz

Worksheet

•

9th - 12th Grade