Free Printable Modern Physics 01

1.

A particle which has zero rest mass and non-zero energy and momentum must travel with a speed:

a)

Equal to c, the speed of light in vacuum

b)

Greater than c

c)

Less than c

d)

Tending to infinity

2.

Dual nature of radiation is shown by

a)

Diffraction and reflection

b)

Refraction and Diffraction

c)

Photoelectric effect alone

d)

Photoelectric effect and diffraction

3.

The energy of a photon of wavelength $\lambda$ is given by

a)

$h\lambda$

b)

$hc\lambda$

c)

$\frac{hc}{\lambda}$

d)

$\frac{\lambda}{hc}$

4.

Rest mass of photon is

a)

0

b)

$\infty$

c)

between 0 and $\infty$

d)

Equal to that of an electron

5.

The momentum of a photon of energy $h\upsilon$ will be

a)

$h\upsilon$

b)

$\frac{h\upsilon}{c}$

c)

$h\upsilon c$

d)

$\frac{h}{\upsilon}$

6.

if the momentum of a photon is P, then its frequency is

a)

$\frac{Ph}{c}$

b)

$\frac{Pc}{h}$

c)

$\frac{mh}{c}$

d)

$\frac{mc}{h}$

7.

An AIR Station is broadcasting the waves of $\lambda$ = 300 m.

If the radiating power of the transmitter is 10kW then the number of photons radiated per second is :

a)

$1.5\times10^{29}$

b)

$1.5\times10^{31}$

c)

$1.5\times10^{33}$

d)

$1.5\times10^{35}$

8.

The energy of photon is $E=h\upsilon$ and the momentum of photon $p=\frac{h}{\lambda}$ , then the velocity of photon will be

a)

$\frac{E}{P}$

b)

$EP$

c)

$\frac{E^2}{P^2}$

d)

$3\times10^{8\ }\ \frac{m}{\sec}$

9.

The approximate wavelength of photon of energy 2.48 eV is

a)

$500\ A$

b)

$5000A$

c)

$2000\ A$

d)

$1000\ A$

10.

The momentum of a photon in an X-Ray beam of wavelength $10^{-10}m$ wavelength is

a)

$1.5\times10^{-23}\ kg-\frac{m}{\sec}$

b)

$6.6\times10^{-24}\ kg-\frac{m}{\sec}$

c)

$6.6\times10^{-44}\ kg-\frac{m}{\sec}$

d)

$2.2\times10^{-52}\ kg-\frac{m}{\sec}$

11.

Energy of a quanta of frequency $10^{15}$ Hz and $h=6.6\times10^{-34}J-\sec$ will be

a)

$6.6\times10^{-19}J$

b)

$6.6\times10^{-12}J$

c)

$6.6\times10^{-49}J$

d)

$6.6\times10^{-41}J$

12.

What is the momentum of a photon having frequency $1.5\times10^{13}Hz$ ?

a)

$3.3\times10^{-29}kg\ \frac{m}{\sec}$

b)

$3.3\times10^{-34}kg\ \frac{m}{\sec}$

c)

$6.6\times10^{-34}kg\ \frac{m}{\sec}$

d)

$6.6\times10^{-30}kg\ \frac{m}{\sec}$

13.

which of following is true for photon

a)

$E=\frac{1}{2}mu^2$

b)

$p=\frac{E}{2v}$

c)

$E=\frac{1}{2}mc^2$

d)

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

14.

The spectrum of radiation $1.0\times10^{14\ }Hz$ is in the infrared region. The energy of one photon of this in joules will be

a)

$6.62\times10^{-48}$

b)

$6.62\times10^{-20}$

c)

$\frac{6.62}{3}\times10^{-28}$

d)

$3\times6.62\times10^{-28}$

15.

The number of photons of wavelength 540 nm emitted per second by an electric bulb of power 100 W is ( take h= $6\times10^{-34}$ )

a)

100

b)

1000

c)

$3\times10^{20}$

d)

$3\times10^{18}$

16.

if the energy of the photon is increased by a factor of 4, then its momentum

a)

Does not change

b)

Decreases by a factor of 4

c)

Increases by a factor of 4

d)

Decreases by a factor of 2

17.

Electron volt is unit of

a)

Potential

b)

Charge

c)

Power

d)

Energy

18.

Assertion : The energy (E) and momentum (p) of a photon are related by $p=\frac{E}{c}$

Reason : The photon behaves like a particle.

a)

Both the assertion and the reason are true and the reason is a correct explanation of the assertion

b)

Both the assertion and reason are true but the reason is not a correct explanation of the assertion

c)

If the assertion is true but the reason is false

d)

If both the assertion and reason are false

19.

Assertion : Mass of moving photon varies inversely as the wavelength.
Reason : Energy of the particle = $Mass\times\left(speed\ of\ light\right)^2$

a)

Both the assertion and the reason are true and the reason is a correct explanation of the assertion

b)

Both the assertion and reason are true but the reason is not a correct explanation of the assertion

c)

If the assertion is true but the reason is false

d)

If both the assertion and reason are false

20.

Monochromatic light of wavelength 667 nm is produced by a helium neon laser. The power emitted is 9mW. The number of photons arriving per second on the average at a target irradiated by this beam is

a)

$9\times10^{17}$

b)

$3\times^{ }10^{16}$

c)

$9\times10^{15}$

d)

$3\times10^{19}$

21.

Light with an energy flux of $25\times10^{4\ }\ \frac{W}{m^2}$ falls on a perfectly reflecting surface at normal incidence. If the surface area is $15\ cm^2$ , the average force exerted on the surface is :- $AIPMT\ 2014$

a)

$1.25\times10^{-6\ }N$

b)

$2.5\times10^{-6\ }N$

c)

$1.2\times10^{-6\ }N$

d)

$3.0\times10^{-6\ }N$

22.

Electromagnetic wave of intensity $1400\ \frac{W}{m^2}$ falls on metal surface on area $1.5\ m^2$ is completely absorbed by it. Find out force exerted by beam. $AIIMS\ 2016$

a)

$14\times10^{-5}N$

b)

$14\times10^{-6}N$

c)

$7\times10^{-5}N$

d)

$7\times10^{-6}N$

23.

A 200 W sodium street lamp emits yellow light of wavelength of $0.6\ \mu m$ assuming it to be 25 % efficient converting electrical energy to light the number of photons of yellow light it emits per second is $AIPMT\ 2012$

a)

$62\times10^{20}$

b)

$3\times10^{19}$

c)

$1.5\times10^{20}$

d)

$6\times10^{18}$

24.

The linear momentum of a 6 MeV photon is

a)

$0.01\ eVsm^{-1}$

b)

$0.02\ eVsm^{-1}$

c)

$0.03\ eVsm^{-1}$

d)

$0.04\ eVsm^{-1}$

25.

The energy flux of sunlight reaching the surface of the earth is $1.52\times10^3\ \frac{W}{m^2}$ The photons in the sunlight have an average wavelength of 520 nm. How many photons per square meter are incident on the earth per second ?

a)

$4\times10^{21}$

b)

$4\times10^{34}$

c)

$4\times10^{31}$

d)

$4\times10^{28}$

Modern Physics 01

Total questions: 25

Worksheet time: 18mins

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