When light of wavelength 322 nm falls on a
potassium surface, electrons are emitted that
have a maximum kinetic energy of 1.35 eV.
What is the work function of potassium?
The speed of light is 3 × 108 m/s and Planck’s
constant is 6.63 × 10−34 J · s.
Answer in units of eV.

What is the cutoff wavelength of potassium?
Answer in units of nm.

What is the threshold frequency for potassium?
Answer in units of Hz.