Question

the modern atomic theory
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light of a certain energy shines on a metal and causes electrons to be emitted.
based on the research of albert einstein, what change would most likely result in stopping the emission of electrons from this metal?
○ an increase in the intensity of the light
○ a decrease in the intensity of the light
○ the use of light that has a higher frequency
○ the use of light that has a lower frequency

Explanation:

Einstein's photoelectric effect theory states that electrons are emitted from a metal only when the incident light has a frequency above the metal's threshold frequency. Lowering the frequency below this threshold will stop electron emission, regardless of light intensity. Higher frequency would increase electron energy, and intensity only affects the number of emitted electrons (if frequency is above threshold).

Answer:

the use of light that has a lower frequency