A laser emits a beam of light whose photons all have the same frequency. When th

Question

A laser emits a beam of light whose photons all have the same frequency. When the beam strikes the surface of a metal, photoelectrons are ejected from the surface. What happens if the laser emits twice the number of photons per second? (a) The photoelectrons are ejected from the surface with twice the maximum kinetic energy, (b) The photoelectrons are ejected from the surface with the same maximum kinetic energy, (c) The number of photoelectrons ejected per second from the surface doubles, (d) Both b and c happen, (e) Both a and c happen. The surface of a metal plate is illuminated with light of a certain frequency. Which of the following conditions determine whether or not photoelectrons are ejected from the metal?

Explanation / Answer

Well, (a) is not obviously true. That is approacching the area of a perpetual motion machine.

(b) is absolutely true.

(c) is true also.

(d) since b and c are true, this is the best option.

(e) a is stupid, so no.

(d) is the answer.

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