Which of the following transitions in a hydrogen atom emits

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Which of the following transitions in a hydrogen atom emits the photon of highest frequency?

1. n = 2 to n = 1
2. n = 2 to n = 6
3. n = 6 to n = 2
4. n = 1 to n = 2

Correct Option: A

V = R		1	-	1
		n²₁		n²₂

or,

1	= R		1	-	1
λ			n²₁		n²₂

Frequency,

v = Rc		1	-	1
		n²₁		n²₂

Note : See the greatest energy difference and also see that the transition is from higher to lower energy level. Hence, it is highest in case of n = 2 to n = 1.