When light above the threshold frequency of a metal is shone on the metal, photoelectrons are emitted. If the power of the light halves, are the maximum kinetic energy of the photoelectrons and/or the number of photoelectrons altered, and if so, how?

When the power of the light is halved, there are half as many photons per unit time. Therefore, the number of photoelectrons emitted is also halved. The maximum kinetic energy of the photoelectrons depends on the frequency of the light, so the maximum kinetic energy of the photoelectrons does not change, because the frequency of the light has not changed.

SS
Answered by Sam S. Physics tutor

1612 Views

See similar Physics A Level tutors

Related Physics A Level answers

All answers ▸

Explain what is meant by resonance.


The electric potential energy of two protons is 1.0MeV. Calculate their separation


a ball is dropped from rest off a cliff of height 50m, determine the final velocity of the ball assuming no air resistance.


What is Newton's Third Law and what is an example of it?


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences