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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 $$2\rightarrow 6$$
$$\lambda=\dfrac{h}{p}=\dfrac{h}{mv}$$
Wavelength is inversely proportional to v.So, inversely proportional to $$\frac{z}{n}$$.
Hence for the wavelength to become 3 times, n has to become 3 times.
So, $$2\rightarrow6.$$

Chemistry

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