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AP® Physics 1 & 2

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Moderate

Photoelectric Observation

APPH12-TONWJE

Analysis of the photoelectric effect was initially important because several real-life observations conflicted with predictions of the classical wave theory of light, giving evidence instead for the validity of photon theory.

Which one of the following is NOT a real-life observation of the photoelectric effect?

A

Different metals require different minimum frequencies of incident light for electrons to be emitted.

B

Changing the frequency of incident light affects the energy of emitted electrons.

C

Changing the intensity of incident light affects the energy of emitted electrons.

D

Incident light must be above a certain cutoff frequency in order for any electrons to be emitted.