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The wavelength of a 1 keV photon is 1.24...

The wavelength of a 1 keV photon is `1.24 xx 10^-9`. What is the frequency of 1 MeV photon ?

A

`1.24 xx 10^15`

B

`24 xx 10^20`

C

`1.24 xx 10^18`

D

`24 xx 10^23`.

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