Question

the modern atomic theory
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which observation provided albert einstein the clue that he needed to explain the photoelectric effect?
light is made up of extremely small particles.
particles that are emitted from a strip of metal are electrons.
shining light on a metal strip produces emissions.
energy of electrons depends on lights frequency, not intensity.

Explanation:

The key observation that guided Einstein's explanation of the photoelectric effect was that the kinetic energy of emitted electrons was determined solely by the frequency of the incident light, not its intensity. Higher intensity light only increased the number of emitted electrons, not their energy, which contradicted classical wave theory and led Einstein to propose the particle nature of light (photons).

Answer:

D. Energy of electrons depends on light's frequency, not intensity.