Photoelectric Effect Overview
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Questions and Answers

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?

  • 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?

  • Continues to increase indefinitely. (correct)
  • Becomes zero.
  • Starts to decrease.
  • Remains constant.

    • Which of the following statements is true about the stopping potential?

    <p>It is a linear function of frequency only after the threshold frequency.</p> Signup and view all the answers

    What relationship does the stopping potential have with the intensity of incident light?

    <p>It is independent of intensity.</p> Signup and view all the answers

    What occurs when light illuminates the emitter plate in the photoelectric effect experiment?

    <p>Electrons are emitted from the emitter plate.</p> Signup and view all the answers

    Which factor does NOT affect the emission of electrons in the photoelectric effect?

    <p>Temperature of the emitter plate</p> Signup and view all the answers

    What happens to the current as the frequency of light increases in the photoelectric effect experiment?

    <p>The current increases.</p> Signup and view all the answers

    Which of the following statements about the emission of electrons is true?

    <p>The emission occurs instantaneously.</p> Signup and view all the answers

    What is the relationship between stopping voltage and light frequency in the photoelectric effect?

    <p>Stopping voltage is frequency dependent.</p> Signup and view all the answers

    What happens to the photoelectric current as the intensity of the incident radiation increases above the threshold frequency?

    <p>It increases proportionally.</p> Signup and view all the answers

    What is the significance of the threshold frequency in photoelectric emission?

    <p>It is the minimum frequency required for electron emission.</p> Signup and view all the answers

    Which statement about the stopping potential is true?

    <p>It is independent of the intensity of the incident radiation.</p> Signup and view all the answers

    How is the maximum kinetic energy of the photoelectrons related to the frequency of the incident radiation?

    <p>It is directly proportional to the frequency above the threshold frequency.</p> Signup and view all the answers

    What characterizes the photoelectric emission process?

    <p>It is an instantaneous process.</p> Signup and view all the answers

    What happens to the photoelectric current when the intensity of light increases?

    <p>It increases proportionally.</p> Signup and view all the answers

    What is the stopping potential in the context of the photoelectric effect?

    <p>The minimum negative potential that stops electron emission.</p> Signup and view all the answers

    How does increasing the positive potential of the collector electrode affect the photoelectric current?

    <p>It increases until it reaches saturation current.</p> Signup and view all the answers

    What does saturation current refer to in the photoelectric effect?

    <p>The maximum photoelectric current when all emitted electrons are collected.</p> Signup and view all the answers

    What is the primary factor that influences the maximum kinetic energy of the emitted electrons in the photoelectric effect?

    <p>The frequency of the light.</p> Signup and view all the answers

    What occurs to the photoelectric current when a negative potential is applied to the collector?

    <p>It decreases to zero.</p> Signup and view all the answers

    What relationship exists between the stopping potential and the emitted electrons' kinetic energy?

    <p>They are independent of each other.</p> Signup and view all the answers

    Which of the following statements about the photoelectric effect is inaccurate?

    <p>Increasing light intensity has no effect on emitted electrons.</p> Signup and view all the answers

    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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    Description

    This quiz explores the fundamental concepts of the photoelectric effect, including the emission of electrons from materials, the relationship between light intensity and photoelectric current, and the significance of stopping and saturation potentials. Test your understanding of how these principles govern the behavior of light and electrons.

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