Question

When a point source of light is at a distance of 50 cm from a photo electric cell, the cut-off voltage is found to be V₀. If the same source is placed at a distance of 1 m from the cell, the cut-off voltage will be –

• A.
• B.
• C. $\mathrm { V } _ { 0 }$
• D. 2V₀

Answer 1

Answer: (C)

$\mathrm { V } _ { 0 }$

Answer 2

Cut-off voltage doesn't depend distance between light source & photo electric cell