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The rest mass of the photon is...

The rest mass of the photon is

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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.

The rest mass of a photon of wavelength lambda is

What is the rest mass of photon?

The kinetic mass of a photon is given by

A free nucleus of mass 24 amu emits a gamma photon (when initially at rest). The energy of the photon is 7 MeV . The recoil energy of the nucleus in KeV is (Assuming 1 "amu"=931 MeV ).

CBSE COMPLEMENTARY MATERIAL-DUAL NATURE OF MATTER AND RADIATION & ATOMS AND NUCLEI-Long Answer Question
  1. The rest mass of the photon is

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  2. Why wave theory of light could not explain the photoelectric effect ? ...

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  3. Why wave theory of light could not explain the photoelectric effect ? ...

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  4. Why wave theory of light could not explain the photoelectric effect ? ...

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  5. A proton is accelerated through a potential difference V. Find the per...

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  6. For what kinetic energy of a neutron will the associated de-Broglie w...

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  7. A nucleus of mass M initially at rest splits into two fragments of mas...

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  8. An electron and proton are possessing the same amount of kinetic energ...

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  9. The electron in a given Bohr orbit has a total energy of -1.51 eV. c...

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  10. Calculate the radius of the third Bohr orbit of hydrogen atom and the ...

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  11. Calculate the longest and shortest wavelength in the Balmer series of ...

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  12. What will be the distance of closest approach of a 5 MeV alpha-particl...

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  13. A 12.5 MeV alpha- particle approaching a gold nucleus is deflected 180...

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  14. Determine the speed of the electron in n=3 orbit of hydrogen atom .

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  15. A sample of a radioactive substance has 10^(6) radioactive nuclei. Its...

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  16. The half life of a radioactive substance is 5 hours. In how much time ...

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  17. At a given instant, there are 25% undecayed radioactive nuclei in a sa...

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  18. Binding energy of ""2He^4 and ""3Li^7 nuclei are 27.37 MeV and 39.4 Me...

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  19. Find the binding energy and binding energy per nucleon of nucleus ""(...

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  20. Is the fission of iron (""(26)Fe^(56)) into (""(13)Al^(28)) as given ...

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  21. Find the maximum energy that beta- particle may have in the following...

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