Question

Work function of emitter in a photo-cell is o.
When it is illuminated by light from a source
then value of photo current i. If emitter is
substituted by a metal of work function 0/2
but source remains unchanged, then value of
photo current in the cell is -​

Answer 1

Work function

Explanation:

• A photocell is a resistor that changes resistance depending on the amount of light incident on it.
• A photocell operates on semiconductor photoconductivity.
• The energy of photons hitting the semiconductor frees electrons to flow, decreasing the resistance.
• Threshold frequency is the minimum frequency of the incident light which can cause the ejection of electrons without giving them additional energy.
• The amount of potential that is required to stop the electrons having maximum kinetic energy from moving is known as stopping potential.