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SAT® Subject Test in Physics

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Moderate

Increasing KE of Electrons

SATPHY-XFQJJ1

When I shine dim green light on a metal surface, some electrons are ejected from the surface. The most energetic ejected electrons have very little energy.

How can we increase the energy of the most energetic ejected electrons?

A

Shine bright red light on the surface.

B

Shine bright green light on the surface.

C

Shine dim red light on the surface.

D

Shine dim purple light on the surface.

E

Shine a red strobe light on the surface.