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The ratio of ...

Question

The ratio of radius of first orbit in hydrogen to the radius of first orbit in deuterium will be:

A

1 : 1

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B

1 : 2

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C

2 : 1

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D

4 : 1

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Solution

The correct option is A 1 : 1
The ratio of radius of first orbit in hydrogen to the radius of first orbit in deuterium will be 1:1. The radius of nth orbit is $r_{n} = 0.53 \times \frac{n^{2}}{Z} A^{o}$ .
It is independent of the mass number.

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