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Question

When an excited hydrogen atom returned to its ground state, some visible quanta were observe along with other quanta. Which of the following transitions much have occurred?

A
21
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B
31
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C
51
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D
41
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Solution

The correct option is A 21
The emission of visible light involves transition to second orbit as it involve Balmer series from fifth to second table. Thus the exited atom in second orbital, transition must be from 2 1 for a atom to its ground state.

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