When light from one source, X, strikes a metal, electrons are ejected. When light from another source, Y, strikes the same metal, electrons are not ejected.
Answer
A
Light from source X has a higher intensity than light from source Y.
B
Light from source X has a lower intensity than light from source Y.
C
Photons of light from source X carry more energy than photons of light from source Y.
D
Photons of light from source X carry less energy than photons of light from source Y.
Explanation
For electrons to be ejected, each photon must have at least the metal’s minimum required energy, called the work function. Since source X ejects electrons but source Y does not, photons from X carry more energy than photons from Y. Intensity affects how many photons arrive, not the energy of each photon.
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