MCQ
When an electron moves from $L-$ shell to $M-$ shell, then it will be accompanied by :
- ✓Energy absorption
- BEnergy emission
- Cgamma-ray emission
- Dgamma-ray absorption
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| Metal | $Li$ | $Na$ | $K$ | $Mg$ | $Cu$ | $Ag$ | $Fe$ | $Pt$ | $W$ |
| $\phi( eV )$ | $2.4$ | $2.3$ | $2.2$ | $3.7$ | $4.8$ | $4.3$ | $4.7$ | $6.3$ | $4.75$ |