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Questions and Answers
In the photoelectric effect, what happens when the retarding potential is increased?
In the photoelectric effect, what happens when the retarding potential is increased?
- Fewer electrons reach the cathode and the current drops (correct)
- More electrons reach the cathode and the current increases
- The current remains constant
- The electrons are completely stopped
What is the process of emitting electrons from a metal surface when exposed to electromagnetic radiation of sufficiently high frequency?
What is the process of emitting electrons from a metal surface when exposed to electromagnetic radiation of sufficiently high frequency?
- Field emission
- Thermal emission
- Secondary emission
- Photoelectric effect (correct)
What is the effect of increasing the intensity of incident light at a fixed frequency of incident radiation in the photoelectric effect?
What is the effect of increasing the intensity of incident light at a fixed frequency of incident radiation in the photoelectric effect?
- The rate of emission of photoelectrons (photocurrent) increases (correct)
- The kinetic energy of the ejected electrons decreases
- The kinetic energy of the ejected electrons increases
- The rate of emission of photoelectrons decreases
What happens to the kinetic energy of the ejected electrons in the photoelectric effect?
What happens to the kinetic energy of the ejected electrons in the photoelectric effect?
What happens to the photoelectric effect at frequencies less than the threshold frequency?
What happens to the photoelectric effect at frequencies less than the threshold frequency?
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Study Notes
The Photoelectric Effect
- When the retarding potential is increased, the electrons are slowed down and eventually stopped from reaching the anode, resulting in a decrease in the photocurrent.
The Process of Emission
- The process of emitting electrons from a metal surface when exposed to electromagnetic radiation of sufficiently high frequency is known as the photoelectric effect.
Effect of Increasing Intensity
- Increasing the intensity of incident light at a fixed frequency of incident radiation in the photoelectric effect results in an increase in the number of electrons emitted, but not their kinetic energy.
Kinetic Energy of Ejected Electrons
- The kinetic energy of the ejected electrons in the photoelectric effect is dependent on the frequency of the incident radiation, not its intensity.
Threshold Frequency
- At frequencies less than the threshold frequency, no electrons are emitted, regardless of the intensity of the incident radiation.
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