Define electron volt and express it in joules

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Solution

Electron volt (eV) definition
1 eV is defined as the energy gained by an electron when it has been accelerated by a potential difference of 1 volt.
Electron volt in joules
We know,
$E = q V, w h e r e E i s t h e e n e r g y (i n J o u l e s), V i s t h e p o t e n t i a l d i f f e r e n c e (i n V o l t s), a n d q i s t h e c h a r g e . S o, 1 e l e c t r o n v o l t = C h a r g e o n 1 e l e c t r o n \times 1 v o l t = 1.6 \times 10^{- 19} C \times 1 V = 1.6 \times 10^{- 19} J (1 C x IV =1 J)$
Hence, $1 eV = 1.6 \times 10^{- 19} J .$

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