When light f=1.2x10^15 hz illuminates an aluminium surface , a stopping potential of 1.5V is needed to reduce photoelectric current to 0. Determine the minimum possible energy of light that can eject electrons from the metal?
1 Answer
Given information is insufficient to calculate the minimum possible energy of light that can eject electrons from the metal.
Explanation:
Recall the definition of Stopping potential the given quantity.
The negative potential applied on the collector of a photoelectric cell at which the photoelectric current becomes zero is called the stopping potential or cut off potential.
Expression
gives the relation between the electronic charge
where,
This equation (1) can not be used to calculate work function or the cutoff frequency
A separate experiment needs to be carried out in which frequency of incident light needs to varied to ascertain threshold frequency and thus find out the minimum possible energy of light that can eject electrons from the metal.