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Match items in Group 1 with items in Group 2, most suitably.
Group 1 Group 2 P. LED 1. Heavy doping Q. Avalanche photodiode 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
asked in Electronics and Communication Engineering, 2003
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