Question

A) Within a photoelectric effect experiment, light shines on the surface of a metal plate and the stopping voltage is measured.
a) If the light intensity is decreased, what happens to the stopping voltage?

decreases

increases    

stays the same

not enough information

b) If the light intensity is decreased, what happens to the number of electrons emitted?

decreases

increases    

stays the same

not enough information

c) If the light wavelength is decreased, what happens to the KE of the emitted electrons?

decreases

increases    

stays the same

B) Light of wavelength 325.0 nm shines on the surface of a metal plate in a photoelectric experiment. The work function of the metal is 2.9 eV.

a) What is the energy of the photon?
eV

b) What is the KE of the electrons just after they leave the surface of the metalplate?
eV

c) Determine the thresholdfrequency of this metal.
Hz

d) What is the magnitude of the stoppingvoltage?
V

Answer 1