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The radius of hydrogen atom in its ground state is 5.3 × 10–11 m. After collision with an electron it is found to have a radius of 21.2 × 10–11 m. What is the principal quantum number n of the final state of the atom
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- n = 4
- n = 2
- n = 16
- n = 3
Correct Option: B
r ∝ n2
| ∴ | = n2 | radius of initial state |
| = n2 | 5.3 × 10-11 |
∴ n2 = 4 or n = 2
