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
√λR(λR−1)
√λ(R−1)λR
√λRλR−1
√λ(R−1)
A
√λR(λR−1)
B
√λRλR−1
C
√λ(R−1)
D
√λ(R−1)λR
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Solution
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1λ=R(1−1n2) n2=λRλR−1 n=√λRλR−1
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