QJEEM21Ph4e29: JEE Main 2021 Physics - Class 12 JEEM21Ph4e29 Solution: The wavelength of the photon emitted by a hydrogen atom when an …

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The wavelength of the photon emitted by a hydrogen atom when an electron makes a transition from n = 2 to n = 1 state is :

Accepted Answer

\Delta

E = 10.2 eV

{{hc} \over \lambda }

= 10.2 eV

\lambda

=

{{hc} \over {(10.2)e}}

=

{{12400} \over {10.2}}\mathop A\limits^o

= 121.56 nm

\simeq

121.8 nm

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