A metal has threshold frequency 5.0×1014Hz. It is illuminated with light of frequency 4.9×1014Hz at a very high intensity. What happens?
a) Photoelectrons are emitted because the high intensity supplies the required energy.
b) Photoelectrons are emitted only after a measurable time lag as energy accumulates.
c) Photoelectrons are not emitted because the frequency is below the threshold frequency.
d) Photoelectrons are emitted but with essentially zero kinetic energy.