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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 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
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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 42
An electron is in excited state in a hydrogen like atom. It has a total energy of-3.4eV. The kinetic energy of electron is E and its de Broglie wavelength is λ. Then λ=hnmE. Value of n, is
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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