EASY
JEE Main/Advance
IMPORTANT
Earn 100

An electron and a photon have same wavelength λ, what is ratio of their kinetic energies?

8.33% studentsanswered this correctly

Important Questions on Dual Nature of Radiation and Matter

EASY
JEE Main/Advance
IMPORTANT
Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment Set-2>Q 27

The number of photons (λ=6630 Å) that strike per second on a totally reflecting screen (as shown in figure), so that a force of 1 N is exerted on the screen, is approximately.

Question Image

MEDIUM
JEE Main/Advance
IMPORTANT
Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment Set-2>Q 28
1.5 mW of 400 nm light is directed at a photoelectric cell. If 0.10% of the incident photons produces photoelectrons, the current in the cell is
MEDIUM
JEE Main/Advance
IMPORTANT
Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment Set-2>Q 31
A mono-chromatic source emits parallel beam of light of power 60 W emits 1018 photons/s. All these photons falls normally on a black surface and get absorbed. The momentum of each photon and the force exerted by these photons on the surface respectively in S.I. units, are
MEDIUM
JEE Main/Advance
IMPORTANT
Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment Set-2>Q 32
A proton and an α-particle are accelerated through the same potential difference. The ratio of their de Broglie wavelengths is
MEDIUM
JEE Main/Advance
IMPORTANT
Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment Set-2>Q 33
For a certain metal, incident frequency υ is five times of threshold frequency υ0 and the maximum velocity of coming out photoelectrons is  8×106 m s-1 . If  υ=2υ0 , the maximum velocity of photoelectrons will be
EASY
JEE Main/Advance
IMPORTANT
Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment Set-2>Q 36
The momentum of a photon having energy equal to the rest energy of an electron is
HARD
JEE Main/Advance
IMPORTANT
Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment Set-2>Q 37
A perfectly reflecting solid hemisphere of radius r is placed in the path of a parallel beam of light of large aperture. If the beam carries an intensity I, find the force exerted by the beam on the hemisphere.
EASY
JEE Main/Advance
IMPORTANT
Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment Set-2>Q 38
A particle having zero rest mass and non-zero energy and momentum must travel with a speed