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Question

A hydrogen atom is in an excited state of principle quantum number n. It emits a photon of wavelength λ when it returns to the ground state. The value of n is
  1. λR(λR1)
  2. λ(R1)λR
  3. λRλR1
  4. λ(R1)

A
λR(λR1)
B
λRλR1
C
λ(R1)
D
λ(R1)λR
Solution
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1λ=R(11n2)
n2=λRλR1
n=λRλR1

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