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Angular momentum of electron moving in third orbit of H-atom is 3h

There are 3 radial nodes in 5p orbital

In Bohr model it is possible to determine both position and momentum of electron simultaneously

Energy of electron in second excited state of ${He}^{+} is - 13.6 eV$

answer is A, C, D.

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Detailed Solution

Since the value of energy of electron in second excited state of helium is, $E = - 13.6 \times \frac{2^{2}}{3^{2}} eV$

As a result the value given in the option B is incorrect.

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