EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 25 - Electrons and Photons>MHT-CET 2017>Q 6

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On a photosensitive material, when the frequency of incident radiation is increased by $30 %$ , the kinetic energy of emitted photoelectrons increases from $0.4 eV$ to $0.9 eV$ . The work function of the surface is

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Important Questions on Electrons and Photons

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 25 - Electrons and Photons>MHT-CET 2020 (13-Oct Shift 1)>Q 1

Threshold frequency for a metal is

15 \times 10^{14} Hz

. The light of wavelength

6000 Å

falls on the metal surface. Which one of the following statements is correct? [velocity of light,

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

]

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 25 - Electrons and Photons>MHT-CET 2020 (12-Oct Shift-1)>Q 2

The maximum velocity of the photoelectron emitted by the metal surface is

v

. Charge and mass of the photoelectron is denoted by

e

and

m

respectively. The stopping potential in volt is

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 25 - Electrons and Photons>MHT-CET 2020 (12-Oct Shift-1)>Q 3

If intensity of incident radiation in a photocell is increased, the stopping potential

HARD

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 25 - Electrons and Photons>MHT-CET 2019>Q 4

A metal surface is illuminated by light of given intensity and frequency to cause photoemission. If the intensity of illumination is reduced to one fourth of its original value then the maximum KE of the emitted photoelectrons would be

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 25 - Electrons and Photons>MHT-CET 2018>Q 5

Following graphs show the variation of stopping potential corresponding to the frequency of incident radiation

(f)

for a given metal. The correct variation is shown in graph (

f_{0} =

Threshold frequency)

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 25 - Electrons and Photons>MHT-CET 2017>Q 6

On a photosensitive material, when the frequency of incident radiation is increased by

30 %

, the kinetic energy of emitted photoelectrons increases from

0.4 eV

to

0.9 eV

. The work function of the surface is