[" 22.A wavelength of a "1KeV" photon is...

[" 22.A wavelength of a "1KeV" photon is "1.2times10^(-9)m" .What is the frequency of "1MeV],[" photon? "],[[" (A) "1.25times10^(20)Hz," (B) "1.75times10^(20)Hz," (C) "2.5times10^(20)Hz," (D) "3.5times10^(19)Hz]]

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