MCQs of Dual Nature of Radiation and Matter

Dual Nature of Radiation and Matter MCQs

MCQs of Dual Nature of Radiation and Matter

Showing 111 to 120 out of 186 Questions

111.

The energy of a beam whoes wavelength is 6.12×10^-5 cm is _____ eV.

(a)	1
(b)	0.01
(c)	12.0
(d)	2

112.

Energy of a photon can not be represented by _____ Where

\bar{n}

is the wave number.

(a)	$h c λ$
(b)	$\frac{h c}{λ}$
(c)	$h c \bar{n}$
(d)	hf

113.

A photon in motion has a mass equal to ______ .

(a)	$\frac{c}{h f}$
(b)	$\frac{h}{λ}$
(c)	hf
(d)	$\frac{h f}{c^{2}}$

114.

Momentum of a photon of wavelength

λ

is _____ .

(a)	$\frac{h}{λ}$
(b)	$\frac{h λ}{c^{2}}$
(c)	$\frac{h λ}{c}$
(d)	Zero

115.

We may state that (A) the energy of a photon of frequency f is E=hf, where h is Planck's constant. (B) the momentum p of a photon is

p = \frac{h}{λ}

, where

λ

is wavelength of photon. Form above statement we may conclude that the wave velocity of light is equal to _____.

(a)	$3 \times 10^{8} {ms}^{- 1}$
(b)	$\frac{E}{p}$
(c)	Ep
(d)	${(\frac{E}{p})}^{2}$

116.

If the energy of photons corresponding to the wavelength of 6000 Å is . The photon energy for a wavelength of 4000 Åis 3.2×10^-19 J will be _____ .

(a)	1.11×10^-19 J
(b)	2.22×10^-19 J
(c)	4.44×10^-19 J
(d)	4.80×10^-19 J

117.

Photo electric effect shows _____ .

(a)	wave like behavior of light
(b)	particle like behavior of light
(c)	both wave like and particle like behavior of light
(d)	neither wave like nor particle behavior of light

118.

The best metal to be used for photo emission is ______ .

(a)	potassium
(b)	sodium
(c)	cesium
(d)	lithium

119.

The maximum energy of electron released in a photocell is independent of _____ .

(a)	the frequency of the incident light
(b)	the intensity of the incident light
(c)	the nature of cathode
(d)	All are true

120.

Sodium surface is illuminated by ultraviolet and visible radiation successively and the stopping potential is determined. This stopping potential is _____ .

(a)	equal in both cases
(b)	more with ultraviolet light
(c)	more with visible light
(d)	varies randomly

Showing 111 to 120 out of 186 Questions