Question

Part 1) When light of wavelength 351 nm falls on a
potassium surface, electrons are emitted that
have a maximum kinetic energy of 1.52 eV.
What is the work function of potassium?
The speed of light is 3 × 10^8 m/s and Planck’s
constant is 6.63 × 10^-34 J · s .
Answer in units of eV.

Part 2) What is the cuto? wavelength of potassium?
Answer in units of nm.

Part 3) What is the threshold frequency for potassium?
Answer in units of Hz