Question Detail
Question
If the stopping potential (V_stop) for photoelectron emission is zero, what is the relationship between the photon's energy (hf) and the work function (W)?
Correct Answer
Option C is the correct answer.
Detailed Explanation
Page 4 explains, 'When Vstop = 0, f = fcutoff, and hfcutoff = W.' Since KE = eVstop, if Vstop is zero, then KE is zero, meaning the photon's energy is just enough to overcome the work function.
Hint
Recall the full Einstein's equation and what 'stopping potential' represents in terms of kinetic energy.