Photoelectric Effect – Practice


1) Calculate the energy that a photon with a wavelength of 90nm has in a) joules b) eV?

2) In a photoelectric effect experiment, the stopping voltage has a magnitude of 4.2V. What is the maximum kinetic energy of the emitted photoelectrons?

3) Calculate the work function (in J) for copper if it has a threshold frequency of 1.135 × 1015 Hz:

4) Calculate the kinetic energy (in J and eV) of photoelectrons emitted from zinc when ultraviolet light with a frequency of 3.65 × 1015 Hz strikes its surface. Zinc has a work function of 6.90 × 10−19 J.


Quick Answers:

1) 13.8 eV

2) 4.2 eV

3) 7.52 × 10-19 J

4) 10.8 eV

Worked Answers: