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Q.

Electron-volt is the unit of energy $(1 e V = 1.6 \times 10^{- 19} J) .$ In H-atom, the binding energy of electron in first orbit is 13.6 eV. The same in joule (J) is

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a

$21.76 \times 10^{- 19} J$

b

$13.6 \times 10^{- 19} J$

c

$10 \times 10^{- 19} J$

d

None of these

answer is B.

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Detailed Solution

Given, $1 e V = 1.6 \times 10^{- 19} J$

$∴ 13.6 e V = 13.6 \times 1.6 \times 10^{- 19} J$

$21.76 \times 10^{- 19} J$

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Electron-volt is the unit of energy 1 eV=1.6×10-19 J. In H-atom, the binding energy of electron in first orbit is 13.6 eV. The same in joule (J) is