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Question

Using Bohr's theory, the transition, so that the electron's de-Broglie wavelength becomes 3 times of its original value in He+ion will be:

A
26
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B
24
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C
14
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D
16
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Solution

The correct option is B 26
λ=hp=hmv
Wavelength is inversely proportional to v.So, inversely proportional to zn.
Hence for the wavelength to become 3 times, n has to become 3 times.
So, 26.

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