If the two metals A and B are exposed to radiation of wavelength 350 nm . The work functions of metals A and B are 4 . 8 eV and 2 . 2 eV . Then choose the correct option

Metal A will not emit photo-electrons

Metal B will not emit photo-electrons

Both metals A and B will emit photo-electrons

Both metals A and B will not emit photoelectrons

EASY

JEE Main

IMPORTANT

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When light of frequency twice the threshold frequency is incident on the metal plate, the maximum velocity of emitted electron is $v_{1}$ . When the frequency of incident radiation is increased to five times the threshold value, the maximum velocity of emitted electron becomes $v_{2}$ . If $v_{2} = x v_{1}$ , the value of $x$ will be _____ .

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Important Questions on Dual Nature of Matter and Radiation

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 20 - Dual Nature of Matter and Radiation>JEE Main - 24 June 2022 Shift 2>Q 75

The light of two different frequencies whose photons have energies

3.8 eV

and

1.4 eV

respectively, illuminate a metallic surface whose work function is

0.6 eV

successively. The ratio of maximum speeds of emitted electrons for the two frequencies respectively will be :

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 20 - Dual Nature of Matter and Radiation>JEE Main - 25 June 2022 Shift 1>Q 76

Given below are two statements :

Statement I : Davisson-Germer experiment establishes the wave nature of electrons.

Statement II : If electrons have wave nature, they can interfere and show diffraction.

In the light of the above statements choose the correct answer from the option given below :

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 20 - Dual Nature of Matter and Radiation>JEE Main - 25 June 2022 Shift 2>Q 77

A proton, a neutron, an electron and an

α

-particle have same energy. If

λ_{p}, λ_{n}, λ_{e}

and

λ_{α}

are the de Broglie's wavelengths of proton, neutron, electron and

α

particle respectively, then choose the correct relation from the following

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 20 - Dual Nature of Matter and Radiation>JEE Main - 26 June 2022 Shift 2>Q 78

A metal surface is illuminated by a radiation of wavelength

4500 \overset{\circ}{A}

. The ejected photo-electron enters a constant magnetic field of

2 mT

making an angle of

90 °

with the magnetic field. If it starts revolving in a circular path of radius

2 mm

, the work function of the metal is approximately

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 20 - Dual Nature of Matter and Radiation>JEE Main - 26 June 2022 Shift 2>Q 79

The stopping potential for photoelectrons emitted from a surface illuminated by light of wavelength

6630 Å

0.42 V

. If the threshold frequency is

x \times 10^{13} s

, where

x

is (nearest integer): (Given, speed light

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

. Planck's constant

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

)

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 20 - Dual Nature of Matter and Radiation>JEE Main - 26 June 2022 Shift 1>Q 80

An electron with speed $v$ and a photon with speed

c

have the same de-Broglie wavelength. If the kinetic energy and momentum of electron are

E_{e}

and

P_{e}

and that of photon are

E_{p h}

and

P_{p h}

respectively. Which of the following is correct?

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 20 - Dual Nature of Matter and Radiation>JEE Main - 27 June 2022 Shift 1>Q 81

α

particle and a carbon

12

atom has same kinetic energy

K

. The ratio of their de-Broglie wavelengths

(λ_{α} : λ_{C 12})

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 20 - Dual Nature of Matter and Radiation>JEE Main - 28 June 2022 Shift 1>Q 82

The de Broglie wavelengths for an electron and a photon are

λ_{e}

and

λ_{p}

respectively. For the same kinetic energy of electron and photon, which of the following presents the correct relation between the de Broglie wavelengths of two?

Important Questions on Dual Nature of Matter and Radiation

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