Physics Crash Course MHT-CET>Chapter 22 - Electrons and Photons>Exercise 1>Q 24

EASY

MHT-CET

IMPORTANT

Earn 100

Assertion: If the maximum kinetic energy of electrons emitted by a photocell is $5 eV$ , then the stopping potential is $5 V$ .

Reason: Stopping potential for the fastest photoelectrons is numerically equal to their kinetic energy.

60% studentsanswered this correctly

Important Questions on Electrons and Photons

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Physics Crash Course MHT-CET>Chapter 22 - Electrons and Photons>Exercise 1>Q 25

The electrons are emitted in the photoelectric effect from a metal surface _____.

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Physics Crash Course MHT-CET>Chapter 22 - Electrons and Photons>Exercise 1>Q 26

For photoelectric effect, the stopping potential depends on

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Physics Crash Course MHT-CET>Chapter 22 - Electrons and Photons>Exercise 1>Q 27

When yellow light is incident on a surface, no electrons are emitted while green light can emit. If the red light is incident on the surface, then

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Physics Crash Course MHT-CET>Chapter 22 - Electrons and Photons>Exercise 1>Q 28

The work function of metals is in the range of $2 eV$ to $5 eV$ . Find which of the following wavelength of light cannot be used for the photoelectric effect. (Consider, $Planck constant = 4 \times 10^{- 15} eVs,$ $velocity of light = 3 \times 10^{8} m s^{- 1})$

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Physics Crash Course MHT-CET>Chapter 22 - Electrons and Photons>Exercise 1>Q 29

An electron is accelerated through a potential difference of

1000 V

. Its velocity is nearly

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Physics Crash Course MHT-CET>Chapter 22 - Electrons and Photons>Exercise 1>Q 30

When potential difference of

9 V

is applied between the two plates, electron accelerate between the plates with velocity

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Physics Crash Course MHT-CET>Chapter 22 - Electrons and Photons>Exercise 1>Q 31

The maximum kinetic energy of photoelectrons emitted from a surface when photons of energy

6 eV

fall on it is

4 eV

. The stopping potential in volts is

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Physics Crash Course MHT-CET>Chapter 22 - Electrons and Photons>Exercise 1>Q 32

The figure shows a plot of photo current versus anode potential for a photo sensitive surface for three different radiations. Which one of the following is a correct statement? Question Image