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Questions and Answers
How does the stopping potential relate to the frequency of incident light?
How does the stopping potential relate to the frequency of incident light?
- It decreases quadratically with frequency.
- It increases linearly with frequency. (correct)
- It remains constant regardless of frequency.
- It is independent of frequency.
Which relationship is observed in Graph 2 regarding saturation current?
Which relationship is observed in Graph 2 regarding saturation current?
- Saturation current is independent of the intensity of light.
- Saturation current is inversely proportional to intensity.
- Saturation current decreases with increasing applied voltage.
- Saturation current is directly proportional to the intensity of incident light. (correct)
What happens to the stopping potential after reaching the threshold frequency?
What happens to the stopping potential after reaching the threshold frequency?
- Continues to increase indefinitely. (correct)
- Becomes zero.
- Starts to decrease.
- Remains constant.
Which of the following statements is true about the stopping potential?
Which of the following statements is true about the stopping potential?
What relationship does the stopping potential have with the intensity of incident light?
What relationship does the stopping potential have with the intensity of incident light?
What occurs when light illuminates the emitter plate in the photoelectric effect experiment?
What occurs when light illuminates the emitter plate in the photoelectric effect experiment?
Which factor does NOT affect the emission of electrons in the photoelectric effect?
Which factor does NOT affect the emission of electrons in the photoelectric effect?
What happens to the current as the frequency of light increases in the photoelectric effect experiment?
What happens to the current as the frequency of light increases in the photoelectric effect experiment?
Which of the following statements about the emission of electrons is true?
Which of the following statements about the emission of electrons is true?
What is the relationship between stopping voltage and light frequency in the photoelectric effect?
What is the relationship between stopping voltage and light frequency in the photoelectric effect?
What happens to the photoelectric current as the intensity of the incident radiation increases above the threshold frequency?
What happens to the photoelectric current as the intensity of the incident radiation increases above the threshold frequency?
What is the significance of the threshold frequency in photoelectric emission?
What is the significance of the threshold frequency in photoelectric emission?
Which statement about the stopping potential is true?
Which statement about the stopping potential is true?
How is the maximum kinetic energy of the photoelectrons related to the frequency of the incident radiation?
How is the maximum kinetic energy of the photoelectrons related to the frequency of the incident radiation?
What characterizes the photoelectric emission process?
What characterizes the photoelectric emission process?
What happens to the photoelectric current when the intensity of light increases?
What happens to the photoelectric current when the intensity of light increases?
What is the stopping potential in the context of the photoelectric effect?
What is the stopping potential in the context of the photoelectric effect?
How does increasing the positive potential of the collector electrode affect the photoelectric current?
How does increasing the positive potential of the collector electrode affect the photoelectric current?
What does saturation current refer to in the photoelectric effect?
What does saturation current refer to in the photoelectric effect?
What is the primary factor that influences the maximum kinetic energy of the emitted electrons in the photoelectric effect?
What is the primary factor that influences the maximum kinetic energy of the emitted electrons in the photoelectric effect?
What occurs to the photoelectric current when a negative potential is applied to the collector?
What occurs to the photoelectric current when a negative potential is applied to the collector?
What relationship exists between the stopping potential and the emitted electrons' kinetic energy?
What relationship exists between the stopping potential and the emitted electrons' kinetic energy?
Which of the following statements about the photoelectric effect is inaccurate?
Which of the following statements about the photoelectric effect is inaccurate?
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Study Notes
Photoelectric Effect
- The photoelectric effect describes the emission of electrons from a material when light shines on it
- The effect is observed when light incident on a metal surface causes the emission of electrons
- The photoelectric current is directly proportional to the intensity of the incident light
- Increasing the positive potential of the collector electrode increases the photoelectric current until all emitted electrons are collected (saturation current)
- Reversing the potential (making it negative) reduces the photoelectric current until it reaches zero (stopping potential)
- The stopping potential is the potential at which the current stops
- The stopping potential ($V_0$) is the minimum negative potential applied to the collector plate that stops the emission of electrons
- It is related to the maximum kinetic energy of the emitted electrons
- The saturation current is the maximum photoelectric current, which occurs when all emitted electrons are collected
Photoelectric Effect Graphs
- The stopping potential increases linearly with frequency until the threshold frequency is reached
- The stopping potential is independent of the intensity of the incident light.
- The stopping potential is linearly proportional to the frequency of incident light beginning at the threshold of frequency.
- The saturation current is proportional to the intensity of incident light
Photoelectric Emission
- There exists a certain minimum frequency (threshold frequency) below which no emission of electrons takes place
- The photoelectric current is directly proportional to the intensity of the incident radiation (above the threshold frequency)
- The stopping potential is independent of the intensity of the incident radiation.
- The maximum kinetic energy of the photoelectrons is directly proportional to the frequency of the incident radiation, above the threshold frequency.
- Photoelectric emission is considered an instantaneous process.
- Time delay (~10-9 s)
- Stopping potential is independent of the incident radiation intensity above the threshold frequency.
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