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Question

The number of waves in the fourth Bohr orbit of hydrogen is .

A
9
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B
3
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C
4
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Solution

The correct option is C 4

Number of waves = CircumferenceWavelength

2πrλ = 2πrhmv = 2πh(mvr) = 2πh × nh2π=2πh × 4h2π

n = 4


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