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SAT® Subject Test in Physics

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Moderate

Increasing Electron Ejection Rate

SATPHY-LCKE15

When I shine dim red light on a metal surface, some electrons are ejected. Which of the following would NOT significantly increase the number of electrons per second being ejected from the surface?

A

shining bright red light on the surface

B

shining bright white light on the surface

C

shining dim (higher energy) purple light on the surface

D

shining bright (higher energy) green light on the surface

E

All of the previous actions would increase the number of electrons per second being ejected from the surface.