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In a sample of H-atoms , electrons de-ex...

In a sample of H-atoms , electrons de-excite from a level 'n' to 1 . The total number of lines belonging to Balmer series are two . If the electrons are ionised from level 'n' by photons of energy 13 eV . Then the kinetic energy of the ejected photoelectrons will be :

A

`12.15 eV`

B

`11.49 eV`

C

`12.46 eV`

D

`12.63 eV`

Text Solution

Verified by Experts

The correct Answer is:
A
`lambda_(y)/lambda_(x)=(m_(x)v_(x))/(m_(y)v_(y)) rArr lambda_(y)/1=(m_(x)v_(x))/((0.25m_(x))(0.75 v_(x)))=16/3`
`:. Lambda_(y)=5.33 Å`
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