Free Printable Nature of light

1.

A particle of light is called a...

a)

Photoelectron

b)

Photon

c)

Proton

d)

Electron

2.

The only way to increase the number of photoelectrons emitted is by increasing the _________ of the light

a)

Intensity

b)

Wavelength

c)

Frequency

d)

Energy

3.

What color of light has the greatest energy per photon?

a)

Red

b)

Green

c)

Blue

d)

Violet

4.

A particle of light is called a...

a)

Photoelectron

b)

Photon

c)

Proton

d)

Electron

5.

The only way to increase the number of photoelectrons emitted is by increasing the _________ of the light

a)

Intensity

b)

Wavelength

c)

Frequency

d)

Energy

6.

What color of light has the greatest energy per photon?

a)

Red

b)

Green

c)

Blue

d)

Violet

7.

A particle of light is called a photon.

a)

True

b)

False

8.

The energy of photoelectrons emitted from a metal surface can be increased by

a)

using light of higher frequency.

b)

using light of longer wavelength.

c)

using light of higher intensity.

d)

using monochromatic, polarized light.

9.

The photoelectric effect only occurs if the light shining on the metal is:

a)

coherent.

b)

above a minimum intensity.

c)

above a minimum frequency.

d)

above a minimum wavelength.

10.

This image is an illustration of

a)

photoelectric effect

b)

Dalton's atomic theory

c)

Bohr model

d)

Quantum mechanical model

11.

Does high-frequency or low frequency light cause the ejection of a greater number of electrons from a metal surface?

a)

only high frequency

b)

only low frequency

c)

both of them

d)

doesn't depend to frequency

12.

What is the best description of 'threshold frequency'?

a)

The minimum energy needed for electrons to escape a surface.

b)

The maximum kinetic energy that an emitted electron has.

c)

The minimum frequency of a photon that will cause an electron to be emitted.

d)

The frequency that an emitted electron will have.

13.

Photoelectric effect provides the evidence for the ______ nature of radiation.

a)

dual

b)

wave

c)

particle

d)

electromagnetic

14.

Photoelectric effect provides the evidence for the ______ nature of radiation.

a)

dual

b)

wave

c)

particle

d)

electromagnetic

15.

If the brightness of a beam of light increases without changing its color, the ______ will increase.

a)

number of photons

b)

frequency of the light

c)

energy of the photons

d)

wavelength of the photons

16.

Light of a given wavelength is used to illuminate the surface of a metal. However, no photoelectrons are emitted. In order to cause electrons to be ejected, light of __________ should be used.

a)

lower energy

b)

higher intensity

c)

shorter frequency

d)

higher frequency

17.

What is the energy, in eV, of a photon that has a wavelength of 620 nm?

a)

1eV

b)

2eV

c)

3eV

d)

4eV

18.

The energy of a photon is directly proportional to its _____ and inversely proportional to its ______.

a)

intensity - speed

b)

wavelength - frequency

c)

frequency - wavelength

d)

intensity - wavelength

19.

Use the graph to find the threshold frequency.

a)

−12×10^-19 Hz

b)

0 Hz

c)

2×10¹⁵ Hz

d)

4×10¹⁵ Hz

20.

In the photoelectric effect, if the incident photons have a wavelength that is larger than the threshold wavelength, _______.

a)

electrons will be ejected from the metal surface

b)

there will be photoelectric current

c)

no electrons will be emitted from the metal surface

d)

the kinetic energy of the ejected electrons increases

21.

What does the slope of the graph represent?

a)

Speed of light

b)

Mass of a photon

c)

Planck's constant

d)

Stopping potential

22.

A metal with a work function of 3.5 eV is exposed to photons with an energy of 3.7 eV. What is the maximum kinetic energy of the emitted photoelectrons?

a)

0.2 eV

b)

0.9 eV

c)

1.1 eV

d)

7.7 eV

23.

What is the energy of a photon with a frequency of 5x10¹⁴ Hz? (you need to do calculation. You have enough time)

a)

2.5x10^-19 J

b)

3.0x10^-19 J

c)

3.3x10^-19 J

d)

4.5x10^-19 J

24.

The diagram shows a circuit involving a photoelectric cell. When UV light is shone onto the metal cathode, electrons are emitted establishing a photocurrent.
Which of the following changes could cause the photocurrent to stop?

a)

Increasing the potential difference of the power supply.

b)

Increasing the frequency of the UV light.

c)

Increasing the intensity of the UV light.

d)

Changing the metal surface to one with a smaller work function.

25.

Light of a single wavelength is incident on a metal. Electrons are released. The intensity of the light is then increased.
Which of the following changes occur?

a)

Rate of electron emission: increase.
Energy of electrons: increase.

b)

Rate of electron emission: decrease.
Energy of electrons: no change.

c)

Rate of electron emission: decrease.
Energy of electrons: increase.

d)

Rate of electron emission: increase.
Energy of electrons: no change.

26.

The photoelectric effect only occurs if the light shining on the metal is:

a)

coherent.

b)

above a minimum intensity.

c)

above a minimum frequency.

d)

above a minimum wavelength.

27.

The graph shows maximum kinetic energy of emitted electrons against frequency of incident light for a number of different metals.
Plank's constant is determined by:

a)

the x-intercept.

b)

the y-intercept.

c)

the gradient.

d)

the area under the graph.

28.

The graph shows maximum kinetic energy of emitted electrons against frequency of incident light for a number of different metals.
The work function is determined by:

a)

the x-intercept.

b)

the y-intercept.

c)

the gradient.

d)

the area under the graph.

29.

The graph shows maximum kinetic energy of emitted electrons against frequency of incident light for a number of different metals.
The threshold frequency is determined by:

a)

the x-intercept.

b)

the y-intercept.

c)

the gradient.

d)

the area under the graph.

30.

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.

31.

The following observations are made about the photoelectric effect:
1. No electrons are emitted below the threshold frequency.
2. Above the threshold frequency the energy of electrons depends on the frequency of the light.
3. Increasing intensity increases the number of emitted electrons.
Which (if any) of these observations can be explained by a wave theory of light?

a)

All of them.

b)

1 and 2 only.

c)

3 only.

d)

None of them.

32.

The photoelectric effect is when:

a)

Electrons collide inside a metal to release photons.

b)

One incident metal electron releases one photon.

c)

One incident photon releases one electron from a metal.

d)

Photons are absorbed in to metal ions releasing electrons.

33.

Light emitted from a laser has wavelength 350 nm. Each pulse of light from the laser lasts for only 1.2 × 10^–13 s. The power delivered in a pulse is 8.0 × 10⁴ W. Calculate the number of photons in a single pulse.

a)

1.7 x 10¹⁰

b)

2.2 x 10¹¹

c)

2.9 x 10⁶

d)

6.7 x 10¹⁷

34.

Photoelectric effect provides the evidence for the ______ nature of radiation.

a)

wave

b)

dual

c)

electromagnetic

d)

particle

35.

Light of a given wavelength is used to illuminate the surface of a metal. However, no photoelectrons are emitted. In order to cause electrons to be ejected, light of __________ should be used.

a)

higher intensity

b)

shorter frequency

c)

lower energy

d)

higher frequency

36.

Use the graph to find the threshold frequency.

a)

2×10¹⁵ Hz

b)

4×10¹⁵ Hz

c)

0 Hz

d)

−12×10^-19 Hz

37.

The energy of photoelectrons emitted from a metal surface can be increased by ________.

a)

using light of higher intensity

b)

using light of higher frequency

c)

using light of longer wavelength

d)

using monochromatic, polarized light

38.

This image is an illustration of_______.

a)

Bohr model

b)

quantum mechanical model

c)

photoelectric effect

d)

Dalton's atomic theory

39.

Give the equation of threshold frequency.

a)

$f_0=\frac{W_0}{h}$

b)

$f_0=\frac{h}{W_0}$

c)

$f_0=W_0-h$

d)

$f_0=W_0h$

40.

What is the energy of a photon with a frequency of 7x10¹⁴ Hz?

$E=hf$

a)

4.6x10^-19 J

b)

3.3x10^-19 J

c)

5.0x10^-19 J

d)

2.5x10^-19 J

41.

Cadmium has a work function of 4.22 eV. Calculate its threshold frequency. $W_0=hf_0$

$\left(1eV=1.60\times10^{-19}J\right)$

a)

1.02×10¹⁵ Hz

b)

5.75×10¹⁵ Hz

c)

3.06×10¹⁵ Hz

d)

8.02×10¹⁵ Hz

42.

The energy of a photon from an electromagnetic wave is 2.25 eV. Calculate its wavelength.

$E=\frac{hc}{\lambda}$

$\left(1eV=1.60\times10^{-19}J\right)$

a)

765 nm

b)

7.65×10^-26 m

c)

552 nm

d)

5.52×10^-26 m

43.

In a photoelectric effect experiment it is observed that no current flows when the wavelength of EM radiation is greater than 570 nm. Calculate the work function of this material in electron- volts in eV.

$W=\frac{hc}{\lambda}$

$\left(1.60\times10^{-19}J=1eV\right)$

a)

1.09 eV

b)

6.54 eV

c)

8.72 eV

d)

2.18 eV

44.

we described this motion using

a)

first law of Newton

b)

2nd law of Newton

c)

3rd law of Newton

d)

Newton is helpless.....

45.

To describe this electron motion in solid our approach would be

a)

we can not see the electron don't know how to describe

b)

lets take a chance to find out electron

c)

lets don't disturb electron

d)

need a very strong microscope

46.

An idea black body

a)

absorbs any radiation completely

b)

emits all radiation

c)

absorbs fully at low temp and emits fully at high temp

d)

absorbs fully and emits fully at a given temp

47.

This graph is emitted during heat of a black body, inference we draw are

a)

it initially increases, finally decrease

b)

the graph is similar to the spread of CORONA virus with moths

c)

it initially increases, finally decrease, passes through a maxm

d)

it initially increases, finally decrease, maxm. displaces with temp

48.

Which phenomenon of Black body radiation is shown here

a)

after blue the bulb becomes white

b)

after blue all infinite energy coming out

c)

at wave length below blue the expt. fails

d)

at low wave length infinite energies are coming out

49.

Main problem Ralyegh-Jeans theorem is

a)

it is connected with scattering of light

b)

it is good at very high wave lengths and fails at low wave length

c)

it is good at very low wave lengths and fails at high wave length

d)

it fails as lamda goes to zero

50.

which expt. is taking place here

a)

photoelectic effect

b)

compton effect

c)

reflection of light

d)

black body radiation

51.

which experiment is taking place?

a)

Phtoelectric effect

b)

Compton effect

c)

Reflection of light from electrons

d)

Black body radiation expt

52.

Main contribution of Planck in the development of Physics is

a)

Atoms in a solid are equivalent to charge harmonic oscillator

b)

Energy of an object should not be arbitrary rather discrete

c)

Energy of an object should not be arbitrary and would follow a definite formula

d)

Any object can have any energy

53.

Using Planck's low how do we remove UV catastrouphe

a)

expand exp series and apply limit $\lambda$ goes to zero

b)

expand exp series and apply limit undefined goes to infinity

c)

expand exp series and apply $\lambda$ large means hf/ $\lambda KT$ small

d)

expand exp series and apply undefined small means hf/undefined large

54.

RJ law is $\frac{8\pi KT}{\lambda4}$

a)

We achieve it from Planck by using $\lambda>>\ means\ \frac{hc}{\lambda KT}<<\$

b)

$\lambda>>\ \frac{hc}{\lambda KT}\ \ also\ l\arg e$

c)

$\lambda\ goes\ to\ zero\ so\ \frac{hc}{\lambda KT}\ goes\ to\ \inf inity$

d)

$\lambda\ goes\ to\ \inf inifinity\ so\ \frac{hc}{\lambda KT\ }\ goes\ to\ zero$

55.

In this picture red balls are

a)

photon emitted

b)

photon absobed

c)

light wave emitted

d)

light wave absorbed

56.

The graph shows how the maximum kinetic energy E_k of photoelectrons emitted from a metal surface varies with the reciprocal of the wavelength λ of the incident radiation.

What is the gradient of this graph?

a)

c

b)

h

c)

hc

d)

h/c

57.

Photons of wavelength 290 nm are incident on a metal plate. The work function of the metal is 4.1 eV

What is the maximum kinetic energy of the emitted electrons?

a)

0.19 eV

b)

4.3 eV

c)

6.9 eV

d)

8.4 eV

58.

Which statement suggests that electrons have wave properties?

a)

Electrons are emitted in photoelectric effect experiments.

b)

Electrons are released when atoms are ionised.

c)

Electrons produce dark rings in diffraction experiments.

d)

Electron transitions in atoms produce line spectra.

59.

When light of a certain frequency greater than the threshold frequency of a metal is directed at the metal, photoelectrons are emitted from the surface. The power of the light incident on the metal surface is doubled.

Which row shows the effect on the maximum kinetic energy and the number of photoelectrons emitted per second?

a)

Maximum kinetic energy: remains unchanged

Number of photoelectrons emitted per second: remains unchanged

b)

Maximum kinetic energy: doubles

Number of photoelectrons emitted per second: remains unchanged

c)

Maximum kinetic energy: remains unchanged

Number of photoelectrons emitted per second: doubles

d)

Maximum kinetic energy: doubles

Number of photoelectrons emitted per second: doubles

60.

Line X on the graphs below shows how the maximum kinetic energy of emitted photoelectrons varies with the frequency of incident radiation for a particular metal.

Which graph shows the results for a metal Y that has a higher work function than X?

a)

b)

c)

d)

61.

A beam of light of wavelength λ is incident on a clean metal surface and photoelectrons are emitted. The wavelength of the light is halved but energy incident per second is kept the same.

Which row in the table is correct?

a)

Maximum kinetic energy of the emitted photoelectrons: Increases

Number of photoelectrons emitted per second: Unchanged

b)

Maximum kinetic energy of the emitted photoelectrons: Decreases

Number of photoelectrons emitted per second: Increases

c)

Maximum kinetic energy of the emitted photoelectrons: Increases

Number of photoelectrons emitted per second: Decreases

d)

Maximum kinetic energy of the emitted photoelectrons: Decreases

Number of photoelectrons emitted per second: Unchanged

62.

In an experiment to demonstrate the photoelectric effect, a charged metal plate is illuminated with light from different sources. The plate loses its charge when an ultraviolet light source is used but not when a red light source is used.

What is the reason for this?

a)

The intensity of the red light is too low.

b)

The wavelength of the red light is too short.

c)

The frequency of the red light is too high.

d)

The energy of red light photons is too small.

63.

Electromagnetic radiation incident on a metal surface can cause electrons to be emitted.

Which of the following statements is correct?

a)

Every photon incident on the surface causes an electron to be emitted.

b)

All the emitted electrons have the same energy.

c)

The range of energy of the emitted electrons depends on the intensity of the radiation.

d)

If the incident radiation is of a single frequency, the number of electrons emitted per second increases if the intensity of the radiation increases.

64.

When comparing X-rays with UV radiation, which statement is correct?

a)

X-rays have a lower frequency.

b)

X-rays travel faster in a vacuum.

c)

X-rays do not show diffraction and interference effects.

d)

Using the same element, photoelectrons emitted using X-rays have the greater maximum kinetic energy.

65.

Monochromatic radiation from a source of light (source A) is shone on to a metallic surface and electrons are emitted from the surface. When a second source (source B) is used no electrons are emitted from the metallic surface. Which property of the radiation from source A must be greater than that from source B?

a)

amplitude

b)

frequency

c)

intensity

d)

wavelength

66.

In a photoelectric experiment, light is incident on the metal surface of a photocell. Increasing the intensity of the illumination at the surface leads to an increase in the

a)

work function

b)

minimum frequency at which electrons are emitted

c)

current through the photocell

d)

speed of the electrons

67.

A particle of light is called a...

a)

Photoelectron

b)

Photon

c)

Proton

d)

Electron

68.

The only way to increase the number of photoelectrons emitted is by increasing the _________ of the light

a)

Intensity

b)

Wavelength

c)

Frequency

d)

Energy

69.

What color of light has the greatest energy per photon?

a)

Red

b)

Green

c)

Blue

d)

Violet

70.

The energy of photoelectrons emitted from a metal surface can be increased by

a)

using light of higher frequency.

b)

using light of longer wavelength.

c)

using light of higher intensity.

d)

using monochromatic, polarized light.

71.

The photoelectric effect only occurs if the light shining on the metal is:

a)

coherent.

b)

above a minimum intensity.

c)

above a minimum frequency.

d)

above a minimum wavelength.

72.

What is the best description of 'threshold frequency'?

a)

The minimum energy needed for electrons to escape a surface.

b)

The maximum kinetic energy that an emitted electron has.

c)

The minimum frequency of a photon that will cause an electron to be emitted.

d)

The frequency that an emitted electron will have.

73.

The energy of the emitted electron is ------------

a)

hf

b)

h/f

c)

hf + Φ

d)

hf - Φ

74.

the energy of the photon is ---------------

a)

hf

b)

h/f

c)

hf + Φ

d)

hf - Φ

75.

In the photo electric effect ---------------- fell onto a polished metal surface.

a)

electrons

b)

photons

c)

waves

d)

plutons

76.

This caused ------------------ to be emitted by the surface

a)

electrons

b)

photons

c)

waves

d)

plutons

77.

The energy of the emitted electrons was measured using a -----------------

a)

standing voltage

b)

striking voltage

c)

stopping voltage

d)

starting voltage

78.

The energy of the emitted photon can also be worked out from the stopping voltage -----------

a)

V

b)

eV

c)

eV - Φ

d)

eV + Φ

79.

The equation for the photoelectric effect is
eV = hf - Φ
The graph of electron energy against frequency is

a)

a straight line through the origin

b)

a straight line gradient h

c)

a straight line with a positive y intercept

d)

not a straight line

80.

the wavelength of a photon can be found using

a)

λ = cf

b)

λ = hf

c)

λ = c/f

d)

λ = f/c

81.

A student has 3 lasers red, green and blue.
When the green laser is shone onto a metal surface electrons are released

a)

the blue laser will release more electrons

b)

the red laser won't release electrons

c)

the cut-off wavelength is shorter than the wavelength of green light.

d)

the blue laser will release more energetic electrons

82.

The diagram shows a circuit involving a photoelectric cell. When UV light is shone onto the metal cathode, electrons are emitted establishing a photocurrent.
Which of the following changes could cause the photocurrent to stop?

a)

Increasing the potential difference of the power supply.

b)

Increasing the frequency of the UV light.

c)

Increasing the intensity of the UV light.

d)

Changing the metal surface to one with a smaller work function.

83.

Light of a single wavelength is incident on a metal. Electrons are released. The intensity of the light is then increased.
Which of the following changes occur?

a)

Rate of electron emission: increase.
Energy of electrons: increase.

b)

Rate of electron emission: decrease.
Energy of electrons: no change.

c)

Rate of electron emission: decrease.
Energy of electrons: increase.

d)

Rate of electron emission: increase.
Energy of electrons: no change.

84.

The photoelectric effect only occurs if the light shining on the metal is:

a)

coherent.

b)

above a minimum intensity.

c)

above a minimum frequency.

d)

above a minimum wavelength.

85.

The graph shows maximum kinetic energy of emitted electrons against frequency of incident light for a number of different metals.
Plank's constant is determined by:

a)

the x-intercept.

b)

the y-intercept.

c)

the gradient.

d)

the area under the graph.

86.

The graph shows maximum kinetic energy of emitted electrons against frequency of incident light for a number of different metals.
The work function is determined by:

a)

the x-intercept.

b)

the y-intercept.

c)

the gradient.

d)

the area under the graph.

87.

The graph shows maximum kinetic energy of emitted electrons against frequency of incident light for a number of different metals.
The threshold frequency is determined by:

a)

the x-intercept.

b)

the y-intercept.

c)

the gradient.

d)

the area under the graph.

88.

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.

89.

The following observations are made about the photoelectric effect:
1. No electrons are emitted below the threshold frequency.
2. Above the threshold frequency the energy of electrons depends on the frequency of the light.
3. Increasing intensity increases the number of emitted electrons.
Which (if any) of these observations can be explained by a wave theory of light?

a)

All of them.

b)

1 and 2 only.

c)

3 only.

d)

None of them.

90.

The photoelectric effect is when:

a)

Electrons collide inside a metal to release photons.

b)

One incident metal electron releases one photon.

c)

One incident photon releases one electron from a metal.

d)

Photons are absorbed in to metal ions releasing electrons.

91.

Light emitted from a laser has wavelength 350 nm. Each pulse of light from the laser lasts for only 1.2 × 10^–13 s. The power delivered in a pulse is 8.0 × 10⁴ W. Calculate the number of photons in a single pulse.

a)

1.7 x 10¹⁰

b)

2.2 x 10¹¹

c)

2.9 x 10⁶

d)

6.7 x 10¹⁷

Nature of light

Total questions: 91

Worksheet time: 2hrs 58mins

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