What is the unit of energy in atomic and nuclear physics ? Define it. 

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Electron volt $(\mathrm{eV})$ is the unit of energy in atomic and nuclear physics.

$1 \mathrm{eV}$ (electron volt): When $1$ electron is accelerated under potential difference of $1$ volt energy acquired by it is called electron volt.

$\therefore 1 \mathrm{eV}=1.602 \times 10^{-19} \mathrm{~J}$ and $1 \mathrm{~J}=6.242 \times 10^{18} \mathrm{eV}$

Table $11.1$ : Work function of some metals

metal

Work function

$\phi_{0}(e \mathrm{~V})$ 

Metal

Work function

$\phi_{0}(e \mathrm{~V})$

$\mathrm{Cs}$ $2.14$ $\mathrm{Al}$ $4.28$
$\mathrm{K}$ $2.30$ $\mathrm{Hg}$ $4.49$
$\mathrm{N} a$ $2.75$ $\mathrm{C} u$ $4.65$
$\mathrm{C} a$ $3.20$ $\mathrm{Ag}$ $4.70$
$\mathrm{Mo}$ $4.17$ $\mathrm{N} i$ $5.15$ 
$\mathrm{P} b$ $4.25$ $\mathrm{P} t$ $5.65$

 

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