Explain why there are no photoelectrons emitted when the frequency of the incident light is less than 5.6 x 10¹⁴ Hz.(i) Calculate the work function for sodium. (ii)Use the graph to calculate the va...
When the frequency of the incident light is less than 5.6 x 10 Hz, no photoelectrons are emitted because the energy of the incident photons is less than the work function of sodium, and hence the electrons do not have enough energy to overcome the work function and be emitted.
(i) We can calculate the work function of sodium using the equation:
Energy of incident photon = work function + maximum kinetic energy of photoelectrons
At the threshold frequency, the maximum kinetic energy of...