First slide

Physical quantities and units

Question

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

Moderate

A

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

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

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

None of these

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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