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  4. The wavelength of a 1 keV photon is 1.24× 10- 9 m. What is the frequency of 1 MeV photon?

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Q. The wavelength of a 1 keV photon is $1.24\times 10^{- 9}$ m. What is the frequency of 1 MeV photon?

NTA AbhyasNTA Abhyas 2022

Solution:

$\frac{h c}{\lambda }=1000eV$
$hv=10^{6}eV$
$\Rightarrow \frac{\lambda \nu}{c}=1000eV$
$\Rightarrow v=\frac{3 \times 10^{8} \times 1000}{1 . 2 \times 10^{- 9}}=2.5\times 10^{20}Hz$