Photoelectric effect question? (1 Viewer)

[tiger858]

hey im having trouble understanding this question

A metal has a work function of 9 ´10-19 J. It is irradiated with UV radiation with a wavelength of 180 nm.

• a) Will photoelectrons be emitted from the surface?
  Explain your answer. (Six lines).
  

• b) If the same metal is irradiated with green light of wavelength 550 nm will photoelectrons be emitted from the metals surface?
  Explain your answer. (Five lines).
  
  sorry its just the photoelectric effect is the only thing givng me some trouble at this point in time

 

[study-freak]

 

[tiger858]

yer thanks for that but isnt that calculated in eV but that is in joules thats what im having trouble getting me head around

 

[cirs]

1 ev = 1.6 * 10^-19 J
Its also in the data sheet