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SAT® Subject Test in Physics

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Metal P and Metal G

SATPHY-4WYYCC

The green graph and the purple graph pictured below represent the photoelectric effect for two different metals ($G$ and $P$).

If electromagnetic radiation of frequency $ 11 \times 10^{14} Hz $ strikes both metal surfaces, which of the following statements must be true?

A

The radiation will have to be more intense to knock electrons off the surface of metal $P$ than metal $G$.

B

No electrons will be knocked off the surface of either metal as a result of the radiation.

C

Electrons will be knocked off both metal surfaces, but they will be knocked off at a greater rate from the surface of metal $G$.

D

Electrons will be knocked off the surface of metal $G$ by the radiation, but will not be knocked off the surface of metal $P$.

E

Electrons will be knocked off both metal surfaces by the radiation, but the most energetic electrons knocked off the surface of metal $G$ will have more kinetic energy than the most energetic electrons knocked off the surface of metal $P$.