1. The maximum wavelength that an electromagnetic wave can have
and still eject electrons from a metal surface is 525 nm. What is
the work function W0 of this metal? Express your answer in
electrons volts.
2. A magnesium surface has a work function of 3.98 eV.
Electromagnetic waves with a wavelength of 215 nm strike the
surface and eject electrons. Find the maximum kinetic energy of the
ejected electrons. Express your answer in electron volts.
3. In a Compton scattering experiment, the incident X-rays have a
wavelength of 0.2685 nm, and the scattered X-rays have a wavelength
of 0.2706 nm. Through what angle θ in the figure are the
X-rays scattered?

4. The de Broglie wavelength of a proton in a particle accelerator
is 2.50 10^-14 m. Determine the kinetic
energy (in joules) of the proton.
5. Suppose that an electron is trapped within a small region and
the uncertainty in its position is 5.80 10^-15 m (about the size of the nucleus
of an medium sized atom). What is the minimum uncertainty in the
electron’s momentum?