i read in one of the undergraduate books that the frequency of the incident wave( it is more than the cut off limit)..falling on a given metal surface at a given intensity results in a current that does NOT depend in the frequency....

 

but, for a given metal , if the frequency is increased then the energy supplied increases thus the kinetic energy of the emitted electron also increases(..conservation law)...since the velocity of the electron now has increased, then dq/dt should increase as well...i.e,..the photo current should also increase...this contradicts the statement in the book...!

if there is something weomg plz let me know....

 

thanx in advance...

 

The speed of the emitted electron does not change how many are ejected per unit time. dq/dt is a measure of how many pass by a given point per unit time rather than the speed.

Dr. swantson, do you think it should be velocity instead of "rather than the SPEED"?

thanx...i got it

Dr. swantson, do you think it should be velocity instead of "rather than the SPEED"?

 

Velocity is a vector and the direction here is not important, so speed would be the appropriate variable to discuss.