STATEMENT-1: The relative speed of separation between two photons travelling in opposite direction in vacuum is zero, where c = 3 × 10 8 m s - 1 . STATEMENT-2: Speed of a photon in vacuum does not depend on the frame of reference.

Statement-1 is False, Statement-2 is True

Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1

Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-1

Statement-1 is True, Statement-2 is False

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IMPORTANT

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What is photo-electric effect?

Important Questions on Dual Nature of Radiation and Matter

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IMPORTANT

Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 11 - Dual Nature of Radiation and Matter>Exercise>Q 19

For a certain metal threshold wavelength is

5675 A °

. Calculate the work function of the metal.

(h = 6.63 \times 10^{- 34} J s)

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IMPORTANT

Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 11 - Dual Nature of Radiation and Matter>Exercise>Q 20

When a metallic surface is illuminated with light of frequency

8.5 \times 10^{14} Hz

the maximum kinetic energy of emitted electrons is

0.52 eV

. When the same surface is illuminated by light of frequency

12.0 \times 10^{14} Hz

the maximum kinetic energy of emitted electrons is

1.97 eV

. Find out work function of the metal.

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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 11 - Dual Nature of Radiation and Matter>Exercise>Q 21

The frequency of a photon of frequency f after falling through height H in the uniform gravitational field due to earth is

f^{'}

. Assume that photon manifest any increase in energy by changing frequency. Choose the correct relation : (Take acceleration due to gravity g)

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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 11 - Dual Nature of Radiation and Matter>Exercise>Q 22

According to Einstein’s photoelectric equation, the plot of the kinetic energy of the emitted photo electrons from a metal versus the frequency, of the incident radiation gives a straight line whose slope

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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 11 - Dual Nature of Radiation and Matter>Exercise>Q 23

Figure shows the variation of photoelectric current $(i)$ with voltage $(v)$ between the electrodes in a photo-cell for two different radiations. If $I_{a}$ and $I_{b}$ are the intensities of the incident radiations and $v_{a}$ and $v_{b}$ are the respective frequencies, then

Question Image

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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 11 - Dual Nature of Radiation and Matter>Exercise>Q 24

A beam of light of intensity

I

is normally incident on a plate of area

A

. If plate absorbs fraction

η

of incident light and reflects rest of it back, then the force exerted by the incident light on the plate is given by [

c

=speed of light]

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IMPORTANT

Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 11 - Dual Nature of Radiation and Matter>Exercise>Q 25

STATEMENT-1: The relative speed of separation between two photons travelling in opposite direction in vacuum is zero, where

c = 3 \times 10^{8} m s^{- 1}

.

STATEMENT-2: Speed of a photon in vacuum does not depend on the frame of reference.

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IMPORTANT

Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 11 - Dual Nature of Radiation and Matter>Exercise>Q 26

Light of wavelength

5000 Å

falls on a metal surface of work function

2.01 e V

. Find the kinetic energy of photoelectrons. Take:

h = 6 .62 \times 10^{- 34} Js, c = 3 \times 10^{8} m / s

What is photo-electric effect?

Important Questions on Dual Nature of Radiation and Matter

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