Atoms And Nuclei Question 434

Question: The wavelength of light emitted from second orbit to first orbits in a hydrogen atom is

Options:

A) $ 1.215\times {{10}^{-7}}m $

B) $ 1.215\times {{10}^{-5}}m $

C) $ 1.215\times {{10}^{-4}}m $

D) $ 1.215\times {{10}^{-3}}m $

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Answer:

Correct Answer: A

Solution:

  • Energy radiated $ E=10.2,eV=10.2\times 1.6\times {{10}^{-19}}J $

$ \Rightarrow $ $ E=\frac{hc}{\lambda } $
Þ $ \lambda =1.215\times {{10}^{-7}}m $



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