- AIs a lightly doped junction diode.
- BHeavily doped junction diode.
- CIs either p-type or n-type.
- DHas no p-n junction.
Explanation:
The reverse breakdown voltage depends on doping of the diode. Hence, in the Zener diode the heavy doping of its p-n junction is done. The depletion region formed in the diode is very thin (<1 m) and the reverse bias voltage of about 5 V which is less than ordinary diode.
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In a sample of radioactive material, what percentage of the initial number of active nuclei will decay during one mean life
|
(a) 69.3% |
(b) 63% |
(c) 50% |
(d) 37% |
In a Young’s double slit experiment, the slit separation is 0.2 cm, the distance between the screen and slit is 1m. Wavelength of the light used is 5000 Å. The distance between two consecutive dark fringes (in mm) is
|
(a) 0.25 |
(b) 0.26 |
(c) 0.27 |
(d) 0.28 |
A photocell stops emission if it is maintained at 2V negative potential. The energy of most energetic photoelectron is
|
(a) 2eV |
(b) 2J |
(c) 2kJ |
(d) 2keV |

16 gm sample of a radioactive element is taken from Bombay to Delhi in 2 hour and it was found that 1 gm of the element remained (undisintegrated). Half life of the element is
|
(a) 2 hour |
(b) 1 hour |
(c) |
(d) |