Practice Test 2

A student claims: “If light is a wave, then any frequency of light should eject electrons from a metal as long as the intensity is high enough.” In the photoelectric effect, which observation most directly contradicts this claim?​

In a modern version of the double-slit experiment, photons are sent one at a time toward two slits. The screen records single localized “clicks,” but after many photons, an interference pattern emerges. Which statement best describes what this implies about models of light?​