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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

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Important Questions on Dual Nature of Radiation and Matter

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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
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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment Set-2>Q 35
How many photons are emitted by a laser source of 5×10-3 W operating at 632.2 nm in 2 s ? h=6.63×10-34Js
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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
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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.
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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
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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment Set-2>Q 39
Dual nature of radiation is shown by
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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment Set-2>Q 43
A particle of mass M at rest decays into two particles of masses m1 and m2, having non-zero velocities. The ratio of the de Broglie wavelength of the particles is
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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment Set-2>Q 44
If work function of a metal is 3 eV and wavelength of subjected radiation to the metal is 275 nm. Then the de Broglie's wavelength (in Å) of photoelectrons emitted by the metal is nearly n. Value of n rounded off to nearest integer, is
(Given hc=1240 eV nm )