What is the frequency of a X-ray photon whose momentum is 1.1 × 10^{-23} kg.m.s^{-2}?

Question

What is the frequency of a X-ray photon whose momentum is $1 \cdot 1 \times$ $10^{-23} kg \cdot m \cdot s ^{-2}$?

Answer 1

SOLUTION : $\quad E=m c^{2} ; E=h v$

$\begin{aligned} \therefore \quad & m c^{2}=h v \quad \therefore \quad v=\frac{m c^{2}}{h}=\frac{m c \times c}{h} \\=& \frac{1.1 \times 10^{-23} \times 3 \times 10^{8}}{6.626 \times 10^{-34}}=5 \times 10^{18} Hz \end{aligned}$