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The rest mass of the photon is...

The rest mass of the photon is

A

0

B

`oo`

C

Between 0 and

D

Equal to that of an electron

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The correct Answer is:
A
Conceptual.
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Which of the following is correct regarding photons? (i) A photon always travels at a speed 3xx10^(8)m//sec in vacuum. (ii) The rest mass of photon is zero. (iii) Let E and p be the energy and linear momentum of a photon and v and lambda be the frequency and wavelength of the same light when it behaves as a wave. Then E=h v =(hc)/(lambda) p=(h v)/(c) =(h)/(lambda) =(E)/(c) (iv) A photon may collide with a meterial particle. The total energy and the total momentum remain conserved in such a collision. The photon may get absorbed and / or a new photon may be emitted. Thus, the number of photons may not be consverved.

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NARAYNA-DUAL NATURE OF RADIATION AND MATTER-EXERCISE - 1 (C.W)
  1. The energy of a photon of wavelength lambda is given by

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  2. The momentum of a photon is 2 xx 10^(-16) gm - cm//sec. Its energy is

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  3. The rest mass of the photon is

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  4. The momentum of the photon of wavelength 5000 Å will be

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  5. The momentum of a photon of energy will be

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  6. A photon in motion has a mass

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  7. If the momentum of a photon is p, then its frequency is

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  8. A particle of mass 5M at rest decays into two particle of masses 2 m a...

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  9. An electron and a photon have same wavelength of 10^(-9) m. If E is th...

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  10. A proton and an alpha-particle are accelerated through same potential ...

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  11. A particle with rest mass m0 is moving with velocity c. what is the d...

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  12. The velocity of a body of mass 10 gm is 2 xx 10^(4) ms^(-1). The value...

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  13. The ratio of wavelength of deutron and proton accelerated through the ...

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  14. The wavelenght of an electron of energy 10 keV will be

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  15. Through what potential difference should an electron be accelerated so...

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  16. Find the ratio of de Broglie wavelength of a proton and as alpha-parti...

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  17. Consider a hypothetical annihilation of a stationary electron with a s...

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  18. The de Broglie wavelength of an electron accelerated by an electric fi...

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  19. The de Broglie wavelenght associated with neutrons in thermal equilibr...

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  20. When an electron experiences a potential difference of 150 volt, the w...

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