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Monochromatic radiation of wavelength la...

Monochromatic radiation of wavelength `lambda` are incident on a hydrogen sample in ground state. Hydrogen atoms absorb the light and subsequently emit radiations of 10 different wavelength . The value of `lambda` is nearly :

A

6

B

5

C

3

D

4

Text Solution

Verified by Experts

The correct Answer is:
B
In the emission spectrum 10 lines are observed, so the energy level (n) to which the sample has been excited after absorbing the radiation is given by, `(n(n-1))/2=10`
`rArr n(n-1)=20," which gives "n=5`
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