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Advent of Modern Physics

Total questions: 45

Worksheet time: 16mins

Name
Class
Date
1.

Which type of fundamental force overcomes the repulsive, electrostatic force between protons in the nucleus of an atom?

a)

the gravitational force

b)

the weak force

c)

the strong force

d)

the magnetic force

2.

What is the mass of an antineutron in kilograms?

a)

1.67 x 10 -27 kg

b)

-1.67 x 10 -27 kg

c)

+1 u

d)

-1 u

3.

The total conversion of 1.00 kilogram of the sun’s mass into energy yields

a)

9.31 × 102 MeV

b)

3.00 × 108 J

c)

8.38 × 1019 MeV

d)

9.00 × 1016 J

4.
Neutrinos have no charge, do not interact with matter, and are known as "God particles".
a)
True
b)
False
5.

1.If you were in spaceship traveling at the speed close to the speed of light (with respect to the earth) you would notice that___________

a)

your pulse rate is different than normal

b)

your mass is different than normal

c)

some of your physical dimensions were smaller than the normal

d)

none of these effects occur

6.
How many postulates are there in the special theory of relativity?
a)
1
b)
2
c)
3
d)
4
7.
The speed of light is constant in all frames of reference.
a)
True
b)
False
8.
One of the most startling consequences of time dilation is that a moving clock ______________ relative to a stationary observer.
a)
Speeds up
b)
Slows down
9.
We experience Einstein's Theory of Relativity in our everyday life when we use
a)
Global Positioning System
b)
Microwave ovens.
c)
Toasters
d)
Graphing Calculators
10.
When you approach a light source, the light from that source has a speed 
a)
greater than c. 
b)
less than c. 
c)
equal to c.
11.
We do not usually observe relativistic effects in our daily lives because 
a)
we are moving at speeds much less than c. 
b)
we are much larger than atoms. 
c)
we are much heavier than elementary particles. 
d)
we are much lighter than stars. 
12.

The speed of light (c) =

a)

186,282 miles per second

b)

300,000,000 meters per second

c)

3.0 x 105 km/sec (kilometers per second)

d)

All answers are correct and equal to one another

13.

In what year did Einstein develop his theory of relativity?

a)

1880

b)

1905

c)

1914

d)

1921

14.
The term ‘relativistic’ refers to effects that are most easily
a)
measured by stationary observers only.
b)
observed when objects travel near the speed of light.
c)
observed when objects move backward in time.
d)
observed when any object moves.
15.

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

16.

What color of light has the greatest energy per photon?

a)

Red

b)

Green

c)

Blue

d)

Violet

17.

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.

18.
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.
19.
This image is an illustration of
a)
photoelectric effect
b)
Dalton's atomic theory
c)
Bohr model
d)
Quantum mechanical model
20.

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.

21.

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

22.
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.
23.

Minimum amount of work required to eject an electron from a metal surface is:

a)

Compton shift

b)

stopping potential

c)

workfunction

d)

absorption spectrum

24.

Use the graph to find the threshold frequency.

a)

−12×10-19 Hz

b)

0 Hz

c)

2×1015 Hz

d)

4×1015 Hz

25.

What are the four fundamental forces from strongest to weakest?

a)

Electrostatic, Gravity, Strong nuclear, weak nuclear

b)

Gravity, Strong nuclear, weak nuclear, Electrostatic

c)

Strong nuclear, Gravity, weak nuclear, Electrostatic

d)

Strong nuclear, Electrostatic, weak nuclear, Gravity

26.

What is the energy of a photon of red light of wavelength 700 nm?

a)

2.8×10−19 J2.8\times10^{-19}\ J

b)

4.6×10−19 J4.6\times10^{-19}\ J

c)

2.0×10−25 J2.0\times10^{-25}\ J

d)

1.6×10−32 J1.6\times10^{-32}\ J

27.

The energy of a photon of light is E. Which is the correct expression for its wavelength, λ?

a)

λ=hEc\lambda=\frac{hE}{c}

b)

λ=Ehc\lambda=\frac{E}{hc}

c)

λ=hcE\lambda=\frac{hc}{E}

d)

λ=Ech\lambda=\frac{Ec}{h}

28.

Among the photons of red, blue and green light, which of the following is in the correct order of increasing energy?

a)

Red, blue, green

b)

Red, green, blue

c)

Green, blue, red

d)

Green, red, blue

29.

Compton shift at 90 degree is given by the formula:

a)

hmo C\frac{h}{mo\ C}

b)

hmc\frac{h}{mc}

c)

hλC\frac{h}{\lambda C}

d)

(1−Cosα)\left(1-Cos\alpha\right)

30.

Compton Shift given by Δλ=λc(1−Cosα)\Delta\lambda=\lambda c\left(1-Cos\alpha\right)  becomes maximum at

a)

scattering angle equal to 90 degree

b)

scattering angle equal to 0 degree

c)

scattering angle equal to 180 degree

d)

scattering angle equal to 360 degree

31.

Which one of the following is most suitable for Compton effect

a)

Heat waves

b)

X-ray

c)

gama ray

d)

visible light

32.

Compton scattering establishes

a)

photonic nature of electromagnetic wave

b)

wave nature of electromagnetic wave

c)

both wave and particle nature of electro magnetic

d)

electron is a matter

33.

Elements of low atomic mass are preferred in Compton effect

a)

low atomic mass elements are easily available

b)

with low atomic mass coulombic attaraction is less and greater probability of making electron free

c)

with low atomic mass coulombic attaraction is high and greater probability of making electron free

d)

with low atomic mass coulombic attaraction is less and lesser probability of making electron free

34.

Photonic energy of x-ray photon of wave lenght 0.1 A is

a)

close to 2 eV

b)

close to 2x 104 eV

c)

close 0.2 eV

d)

close to 2 x 102 eV

35.

In Compton effect we can use X-ray because

a)

it is easy to produce

b)

it has very small wave length

c)

x-ray photon has very high energy

d)

it is a X-ray diffraction experiment

36.

We do not use heavy atoms in Compton effect study because

a)

in heavy atom electron-nuclear coulombic attraction is very strong

b)

in heavy atom electron-nuclear coulombic attraction is very weak

c)

in heavy atom electron-electron coulombic attraction is very strong

d)

in heavy atom electron-visible light interaction is very weak

37.

An electron and a proton have same de Broglie wave length then relation between energy of electron and proton is. Use the relation λ=hmv  and E=12 mv2\lambda=\frac{h}{mv}\ \ and\ E=\frac{1}{2\ }mv2  

a)

Electron energy > Proton energy

b)

Electron energy < Proton energy

c)

Electron energy = Proton energy

d)

both energies are infinite

38.

de Borglie hypothesis states

a)

any matter can show wave nature

b)

any matter sometimes becomes wave

c)

any matter can sometime show the property of wave

d)

only electron can sometime show the property of wave

39.

According to HEISENBERG uncertainty principle:

a)

Δx. Δt ≈ h

b)

Δx. ΔP ≈ h

c)

ΔE. ΔP ≈ h

d)

Δx. ΔE ≈ h

40.

______ law which state that the maximum wavelength of a black body radiation is inversely proportional to the absolute temperature is:

a)

Wein's

b)

Stephen's

c)

Rayleigh Jean's

d)

Plank's

41.

The value of Compton shift at 90 degree, in J is:

a)

2.429 x 10^-12

b)

3.637 x 10^-10

c)

1.055 x 10^-11

d)

2.957 x 10^-16

42.

Pair production takes place only if the energy of the photon is greater than equal to:

a)

0.55 MeV

b)

1.638 x 10^-13 J

c)

1.099 MeV

d)

1.609 x 10^-19 J

43.

Pair production only occur if the wavelength of the incident photon is of the order:

a)

10^-4 m

b)

10^-6 m

c)

10^-14 m

d)

10^-10 m

44.

The absorption % of the incident radiation by the perfect black body is:

a)

0

b)

50

c)

100

d)

almost 95

45.

Galilean transformation is applicable to a frame of reference which is:

a)

Moving

b)

stationary

c)

inertial frame

d)

non inertial frame

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