First slide

Bohr's atom model

Question

The radius of the Bohr orbit in the ground state of hydrogen atom is 0.5 A. The radius of the orbit of the electron in the third excited state of $H e^{+}$ will be

Moderate

A

8 $Å$
B

4 $Å$
C

0.5 $Å$
D

0.25 $Å$

Solution

$For third excited state, n = 4 r_{n} = r_{0} \frac{n^{2}}{2} or r_{1} = 0.5 \times \frac{4 \times 4}{2} Å = 4 Å$

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