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  4. The radius of the first Bohrs orbit of hydrogen is 0.05 nm the radius of the 10th orbit is

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Q. The radius of the first Bohrs orbit of hydrogen is $0.05\,nm$ the radius of the $10th$ orbit is

KCETKCET 2022

Solution:

$r_{n}=r_{1} n_{2}$
$r _{10}=0.05 \times 10^{2}=0.05 \times 100=5\, nm$