WAEC Physics 2012 Objective — Question 46

Question 46 of 50 from the West African Examinations Council (WAEC) Physics 2012 Objective paper, with the correct answer and a full explanation.

For photoelectric emission, the threshold frequency is the

A. A. maximum frequency of incident radiation that will eject electrons
B. B. minimum frequency of incident radiation required to eject electronsCorrect
C. C. frequency which results in the emission of the greater number of electrons
D. D. frequency which impacts greatest kinetic energy to emitted electrons

Explanation

The threshold frequency is the minimum frequency of incident radiation which must attain before it can eject electrons from a metal's surface.

…and/or go further with premium services and No Ads.