Q.

According to the Bohr Theory, which of the following transitions in the hydrogen atom will give rise to the least energetic photon?

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a

n = 5 to n = 3

b

n = 6 to n = 1

c

n = 5 to n = 5

d

n = 5 to n = 4

answer is C.

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Detailed Solution

Energy of photon obtained from the transition n = 6 to n = 5 will have least energy

            ΔE=13.6Z2(1n1 21n22)

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