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For a photoelectric cell, the graph in figure showing the variation of the cut-off voltage $V_{0}$ with frequency (v) of incident light is

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Important Questions on Dual Nature of Radiation and Matter

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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment>Q 8

A beam of light consists of three distinct wavelengths

λ, 2 λ

and

3 λ

. The number of photons passing through unit area per unit time for three wavelengths are

n, 2 n

and

3 n

respectively. Then the intensity of the beam is

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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment>Q 9

Figure shows the graph which depicts the stopping potential $(V_{0})$ versus frequency $(V)$ of incident radiations for two metals $M_{1}$ and $M_{2}$ . Select the correct alternative.

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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment>Q 10

A point source of constant power

P

is emitting photons of frequency

v

. What is the photon flux at a distance

r

from the source?

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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment>Q 14

The radiation force experienced by a disc of radius

r

when exposed to radiation of intensity

/

F

, then the maximum value of

F

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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment>Q 4

Choose the correct alternative.

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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment>Q 6

A metal surface is irradiated by light of wavelength,

λ = 200 nm

. The most energetic emitted photoelectrons are bent in a circle of radius

2 m

by a magnetic field of

3.02 \times 10^{- 6}

T perpendicular to the velocity. Then

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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment>Q 7

A point source of light emitting power

W

is placed inside at the center of a soap bubble of radius

R .

Surface of soap bubble is perfectly absorbing and

P_{0}

is the atmospheric pressure. If

P_{R}

is the radiation pressure on the surface of soap bubble due to point source and

P_{i}

is the net pressure inside the soap bubble having surface tension

T

, then choose the correct answer

c

is the speed of light)

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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment>Q 8

Assertion : Work function of aluminium is $4.2 e V .$ Emission of electrons will not be possible if two photons each of energy $2.5 e V$ collide with free electrons of aluminium.

Reason : For photoelectric emission the energy of each photon should be greater than or equal to the work function of aluminium.

For a photoelectric cell, the graph in figure showing the variation of the cut-off voltage V0 with frequency (v) of incident light is

Important Questions on Dual Nature of Radiation and Matter

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For a photoelectric cell, the graph in figure showing the variation of the cut-off voltage $V_{0}$ with frequency (v) of incident light is