Quantum Physics questions are from Physics with Modern Physics by Wolfgang Bauer and Gary D. Westfall
Problems:
1. Ultraviolet light of wavelength 250 nm is incident on a material with a stopping potential of 0.25 volts. The work function of the material is:
a) 4.0 eV
b) 3.3 eV
c) 2.3 eV
d) 5.2 eV
2. To have a larger photocurrent, which of the following should occur? (select all the correct changes)
a) brighter light
b) dimmer light
c) higher frequency
d) lower frequency
3. A 50.0 kg particle has a de Broglie wavelength of 20.0 cm.
a) How fast is the particle moving?
b) What is the smallest speed uncertainty of the particle if its position uncertainty is 20.0 cm.