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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 3λ
When the electron jumps from 2E level to E level, a photon of wavelength λ is emitted. Thereby,
hv=2EEhcλ=E or
λ=hcE....(1)
When the electron jumps from 4E3 level to E level, a photon of wavelength λ1 is emitted. Thereby,
hv=4E3Ehcλ1=E3 or
λ1=3hcE
From equation 1,
λ1=3λ

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