Physics - Online Test

When a diode is connected in a Reverse Bias condition, a positive voltage is applied to the N-type material and a negative voltage is applied to the P-type material.

The positive voltage applied to the N-type material attracts electrons towards the positive electrode and away from the junction, while the holes in the P-type end are also attracted away from the junction towards the negative electrode.

The net result is that the depletion layer grows wider due to a lack of electrons and holes and presents a high impedance path, almost an insulator. The result is that a high potential barrier is created thus preventing current from flowing through the semiconductor material

When the stone ll reach at the same point from where is was thrown it ll have same velocity but with opposite sign. 

So  initial velocity u = -20 m/s

Final velocity before hitting ground = v

Distance covered s = 50 m

Acceleration due to gravity a = 9.8 m/s​​​​​​2

We know

v2−u2=2as

=>v2−(−20)2=2×9.8×50

=>v2−400=980

=>v2=1380

=>v=1380−−−−√=±37.1

As this velocity is in opposite direction is initial velocity so sign ll be negative.

v = -37.1 m/s