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Question

# The given diagram indicates the energy level of a certain atom. When an electron moves from 2E level to E level, a photon of wavelength λ is emitted. The wavelength of photon emitted during its transition from 4E3 level to E level is: ____ 2E ____4E3 ____ E

A
λ3
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B
3λ4
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C
4λ3
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D
3λ
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Solution

## The correct option is D 3λWhen the electron jumps from 2E level to E level, a photon of wavelength λ is emitted. Thereby, hv=2E−Ehcλ=E or λ=hcE....(1) When the electron jumps from 4E3 level to E level, a photon of wavelength λ1 is emitted. Thereby, hv=4E3−Ehcλ1=E3 or λ1=3hcE From equation 1, λ1=3λ

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