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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

102 nm

B

150 nm

C

82 nm

D

122 nm

Text Solution

Verified by Experts

The correct Answer is:
D
For least energetic photon, wavelength should be maximum
`[E= E_(2)- E_(1)= 10.2eV]`
`E= (hc)/(lamda) rArr lamda_("max") = (1240)/(10.2) nm rArr lamda_("max") = 121.57nm`
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