Question

The energy of a 100-nm photon is

Answer 1

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E=λnhc

n=hcEλ

    =6.626×10−34×3×1081×100×10−9

    =5×1017.

Hence,  5×1017  photons of light having wavelength 100nm  can provide 1J energy

Hence, the correct option is C

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Answer 2

Answer:

A proton has kinetic energy E = 100 keV which is equal to that of a photon. The wavelength of photon is λ2 and that of proton is λ1. The ratio of λ2/λ1 is proportional to

E2