Photoelectric Effect & Work Functions

Question 1

Equation for kinetic energy of ejected electron

Answer 1

KE = Ephoton - work function

Ephoton = hv

Question 2

True or false: number of electrons ejected = number of photons ejected

Answer 2

True

Question 3

What is threshold frequency?

Answer 3

The minimum light frequency that will cause electrons to be ejected.
- From there, if you increase the intensity of the light, this will increase the number o electrons that will leave the surface
- But, if you don’t pass the threshold frequency, increasing the intensity will have no effect on the ejection of electrons

Question 4

De Broglie wave function

Answer 4

λ = h/mv

Question 5

Equation to calculate threshold frequency (in formula sheet, just need to do algebra)

Answer 5

λ = hc/Φ