Alpha Question Bank for Engineering: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise - 1>Q 27

EASY

JEE Main/Advance

IMPORTANT

Earn 100

The de Broglie's wavelength of an electron moving with a velocity $1.5 \times 10^{8} m s^{- 1}$ is equal to that of a photon. The ratio of the kinetic energy of the electron to that of the energy of photon is (apply non-relativistic formula for electron):

20% studentsanswered this correctly

Important Questions on Dual Nature of Matter and Radiation

EASY

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise - 1>Q 28

A particle of mass

M

at rest decays into two particles of masses

m_{1}

and

m_{2}

having non zero velocities. The ratio of the de Broglie's wavelengths of the particles,

λ_{1} / λ_{2}

is:

EASY

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise - 1>Q 29

Let

p

and

E

denote the linear momentum and the energy of a photon. For another photon of smaller wavelength (in same medium)

EASY

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise - 1>Q 30

The de Broglie wavelength of a neutron corresponding to root mean square speed at

927 ° C

is

λ

. What will be the de Broglie wavelength of the neutron corresponding to root mean square speed at

27 ° C

?

EASY

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise - 1>Q 31

The wavelength

λ

of de Broglie waves associated with an electron (mass

m

, charge

e

) accelerated through a potential difference of

V

is given by (

h

is Planck’s constant) :

EASY

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise - 1>Q 32

In Davisson-Germer experiment, the filament emits

EASY

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise - 1>Q 33

In the Davisson and Germer experiment, the velocity of electrons emitted from the electron gun can be increased by :

HARD

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise - 1>Q 35

Energy evolved from the fusion reaction

2 {}_{1}^{2}H = 2 {}_{1}^{4}{He} Q

is to be used for the production of power. Assuming the efficiency of the process to be

30 % .

Find the mass of deuterium that will be consumed in a second for an output of

50 MW . {}_{1}{He}^{4} = 4.002603 amu and {}_{1}H^{2} = 2.014102 amu .

MEDIUM

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise - 2>Q 1

The photoelectrons emitted from a metal surface :