Aluminum has a frequency threshold of 9.846 × 1014 Hz. Which best explains what will happen when light with a frequency below the frequency threshold strikes aluminum?

In the photoelectric effect, each photon must have at least the threshold frequency to provide enough energy to eject an electron. Light with a frequency below aluminum’s threshold does not meet that requirement, so no electrons will be ejected, even if the light is very intense. The correct choice is “No electrons will be ejected.”

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