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What is the wavelength of ligth for the ...

What is the wavelength of ligth for the least energetic photon emitted in the Lyman series of the hydrogen spectrum. (Take , hc =1240 eV -nm)

A

122 nm

B

82 nm

C

150 nm

D

102 nm

Text Solution

Verified by Experts

The correct Answer is:
B
Given, `hc=1240eV`
For least energetic photon `DeltaE=E_(2)-E_(1)=10/2eV`
We know that, `DeltaE=(hc)/(lamda),lamda=(hc)/(DeltaE),lamda=(1240)/(10.2)`
`implies lamda=121.56=122nm`
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