Match items in Group 1 with items in Group 2, most suitably.
Group 1 Group 2
P. LED 1. Heavy doping
Q. Avalanche photo diode 2. Coherent radiation
R. Tunnel diode 3. Spontaneous emission
S. LASER 4. Current gain
(A) P - 1, Q - 2, R - 4, S - 3
(B) P - 2, Q - 3, R - 1, S - 4
(C) P - 3 Q - 4, R - 1, S - 2
(D) P - 2, Q - 1, R - 4, S - 3
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Answer:
The correct answer is (C) P - 3 Q - 4, R - 1, S - 2
Explanation:
LED - Spontaneous emission
Avalanche photo diode - current gain
tunnel diode - heavy doping
laser - coherent radiation
LED works on the principal of spontaneous emission.
In the avalanche photo diode due to the avalanche effect there is large current gain.
Tunnel diode has very large doping.
LASER diode are used for coherent radiation.
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