Wavelength of a 1 keV photon is 1.24 × 10⁻⁹ m. Frequency of a 1 MeV photon is:
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Wavelength of a 1 keV photon is 1.24 × 10⁻⁹ m. Frequency of a 1 MeV photon is:

G1 Physics · Accepted Answer

Since 1 MeV = 1000 keV, the 1 MeV wavelength is 1.24 × 10⁻¹² m. ν = c/λ = 3 × 10⁸/(1.24 × 10⁻¹²) ≈ 2.42 × 10²⁰ Hz. Answer: B.