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hydrogen atom emits light when it change...

hydrogen atom emits light when it changes from `n=5` energy level to `n=2` energy level. Which colour of light would the atom emit ?

A

red

B

yellow

C

green

D

voilet.

Text Solution

Verified by Experts

The correct Answer is:
D
`(1)/(lambda)=R[1/(2^2)-1/(5^2)]=R[1/(4)-1/(25)]=(21R)/(100)`
`therefore lambda=(100)/(21R)=(100)/(21xx1.1xx10^7)=(100)/(23.1)xx10^-7m=4346Å`
This corresponds to voilet.
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