Atomic Structure Question 374

Question: The number of photons of light having wave number ‘x’ in 10 J of energy source is:

Options:

A) $ 10hcx $

B) $ \frac{hc}{10x} $

C) $ \frac{10}{hcx} $

D) None of these

Show Answer

Answer:

Correct Answer: C

Solution:

  • $ E=\frac{nhc}{\lambda }=nhc\overline{v}( \because ,\overline{v}=\frac{1}{\lambda } ) $
    $ \therefore 10=nhc\overline{v}, $ or $ n=\frac{10}{hc\overline{v}}=\frac{10}{hcx} $


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