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Question

If the speed of electron in the Bohr's first orbit of hydrogen is x, the speed in the third orbit is:

A
x/9
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B
x/3
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C
3x
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D
9x
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Solution

The correct option is B x/3
We know that,
vnzn

Given:
v1=x

v3=x3

Hence, option B is correct.

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