Q.

The wavelength of a 1 keV photon is 1.24 x 10-9 m. What is the frequency of 1 MeV photon? [1991]

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a

1.24×1015

b

1.24×1020

c

1.24×1018

d

2 X 4 X 1023

answer is B.

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Detailed Solution

Here hcλ=1000eV and hv=106eV Hence, V=103cλ=103×3×1081.24×109=2.4×1020Hz

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The wavelength of a 1 keV photon is 1.24 x 10-9 m. What is the frequency of 1 MeV photon? [1991]