Dual Nature of Radiation and Matter

Question: Wavelength of a 1 keV photon is $1.24 \times {10^{ - 9}}m$. What is the frequency of 1 MeV photon



1) $1.24 \times {10^{15}}Hz$
2) $2.4 \times {10^{20}}Hz$
3) $1.24 \times {10^{18}}Hz$
4) $2.4 \times {10^{23}}Hz$
Solution: Explanation: No Explanation
Photon and Photoelectric Effect

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