GATE ECE 2003 | Question: 40

Question

Match items in Group $1$ with items in Group $2,$ most suitably.

$$\begin{array}{ll} \textbf{Group 1} & \textbf{Group 2} \\ \text{P LED} & \text{1 Heavy doping} \\ \text{Q Avalanche photodiode} & \text{2 Coherent radiation} \\ \text{R Tunnel diode} & \text{3 Spontaneous emission} \\ \text{S LASER} & \text{Current gain} \end{array}$$

• A. $\text{P – 1   Q – 2   R – 4   S – 3}$
• B. $\text{P – 2   Q – 3   R – 1   S – 4}$
• C. $\text{P – 3   Q – 4   R – 1   S – 2}$
• D. $\text{P – 2   Q – 1   R – 4   S – 3}$