Question:
The wavelength of an X-ray beam is 10A The mass of a fictitious particle having the same
energy as that of the X-ray photons is $\frac{x}{3} \mathrm{~h} \mathrm{~kg}$.
The value of $x$ is__________.
$(h=$ Planck's constant $)$
Solution:
$\frac{\mathrm{hc}}{\lambda}=\mathrm{mc}^{2}$
$\mathrm{m}=\frac{\mathrm{h}}{\mathrm{c} \lambda}$
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