Kinetic Energy of the Photoelectron
How light frequency determines the maximum energy of emitted electrons
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K.E. of Photoelectron
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The white light was unable to discharge the electroscope (eject the electrons) but the ultraviolet light could. Why??? The ultraviolet light had a higher frequency .... ... a higher energy.
b) nature of emitting metal Typical Plot of Frequency of
fo - Threshold Frequency - frequency below which no photoelectrons will be emitted
Below Threshold?
No Emission
Above Threshold?
Emission
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Check Your Understanding
5 quick questions — pick an answer to see if you’re right.
1. The kinetic energy of a photoelectron is determined by the light's frequency and…
2. What is the threshold frequency?
3. Ultraviolet light discharged an electroscope but white light did not. Why?
4. Very bright light below a metal's threshold frequency shines on it. What happens?
5. Which color of visible light would give photoelectrons the most kinetic energy from the same metal?