Please solve question no.2.

D e a r S t u d e n t, G i v e n, λ = 0.01 A^{0} = 0.01 \times 10^{- 10} m X - r a y s b e l o n g t o e l e c t r o m a g n e t i c s p e c t r u m . H e n c e, A s s u m p t i o n : s p e e d o f X - r a y s, v = 3 \times 10^{8} m / s W e h a v e, v e l o c i t y o f t h e w a v e = f r e q u e n c y \times w a v e l e n g t h \Rightarrow v = f \times λ \Rightarrow f = \frac{v}{λ} = \frac{3 \times 10^{8}}{0.01 \times 10^{- 10}} = \frac{3 \times 10^{8}}{10^{- 12}} = 3 \times 10^{20} H z R e g a r d s .

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