The forward-bias characteristics of two diodes $D_{1}$ and $D_{2}$ are shown. Their knee voltages are respectively (approximately)
Take the knee voltage as the voltage at which the current begins to rise appreciably.

Question

The forward-bias characteristics of two diodes $D_{1}$ and $D_{2}$ are shown. Their knee voltages are respectively (approximately)

Circuit diagram

Take the knee voltage as the voltage at which the current begins to rise appreciably.

TestHub · Accepted Answer

Read the approximate knee of each forward-bias curve, where current begins to rise appreciably.

$V_{th, 1} \approx 0.4 V$

$V_{th, 2} \approx 0.7 V$

These are approximate turn-on values, not intercepts found by extrapolating a straight segment of these curved plots.

Answer A.

Physics - Semiconductors Question with Solution | TestHub