MCQ
In a zener diode, break down occurs in reverse bias due to
- AImpactionisation
- ✓Internal field emission
- CHigh doping concentration
- DAll of these
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| List $I$ | List $II$ |
| $I$ Doublet of sodium | $(A)$ Visible radiation |
| $II$ Wavelength corresponding to temperature associated with the isotropic radiation filling all space | $(B)$ Microwave |
| $III$ Wavelength emitted by atomic hydrogen in interstellar space | $(C)$ Short radio wave |
| $IV$ Wavelength of radiation arising from two close energy levels in hydrogen | $(D)$ $X-$ rays |


