Question
(a) What is the binding energy of electrons to a material from which 4.00-eV electrons are ejected by 400-nm EM radiation? (b) What is unreasonable about this result? (c) Which assumptions are unreasonable or inconsistent?
1. $-0.90 \textrm{ eV}$
2. Binding energy can not be negative.
3. The kinetic energy of the electron should be less, or the wavelength of the photon should be much shorter.
Solution Video