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Q.

The energy of an electron in the first Bohr orbit of hydrogen atom is ${−2.18×10}^{- 18} J .$ Its energy in the third Bohr orbit is ______.

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a

Three times of this value

b

$\frac{1}{27}$ of this value

c

$\frac{1}{9}$ th of this value

d

One third of this value

answer is C.

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Detailed Solution

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$En = \frac{E_{1}}{n^{2}}$ , $E_{3} = \frac{E_{1}}{9}$

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