What is the unit of energy in atomic and nuclear physics ? Define it.
What is the unit of energy in atomic and nuclear physics ? Define it.
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 $\phi_{0}(e \mathrm{~V})$ |
| $\mathrm{Cs}$ | $2.14$ | $\mathrm{Al}$ | $4.28$ |
| $\mathrm{K}$ | $2.30$ | $\mathrm{Hg}$ | $4.49$ |
| $\mathrm{N} a$ | $2.75$ | $\mathrm{C} u$ | $4.65$ |
| $\mathrm{C} a$ | $3.20$ | $\mathrm{Ag}$ | $4.70$ |
| $\mathrm{Mo}$ | $4.17$ | $\mathrm{N} i$ | $5.15$ |
| $\mathrm{P} b$ | $4.25$ | $\mathrm{P} t$ | $5.65$ |
Similar Questions
In Thomson experiment of finding $e/m$ for electrons, beam of electron is replaced by that of muons (particle with same charge as of electrons but mass $208$ times that of electrons). No deflection condition in this case satisfied if
In Thomson experiment of finding $e/m$ for electrons, beam of electron is replaced by that of muons (particle with same charge as of electrons but mass $208$ times that of electrons). No deflection condition in this case satisfied if
In Thomson's method of determining $e/m$ of electrons
In Thomson's method of determining $e/m$ of electrons
$1$ $J$ is equal to how many electron volt?
$1$ $J$ is equal to how many electron volt?
When subjected to a transverse electric field, cathode rays move
When subjected to a transverse electric field, cathode rays move
Who invented $X-$ rays?
Who invented $X-$ rays?