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

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Question: Which of the following statements about the photoelectric effect is true?

Options:

  1. Light intensity affects the energy of emitted electrons
  2. Only light above a certain frequency can cause emission
  3. Electrons are emitted regardless of light frequency
  4. The number of emitted electrons is independent of light intensity

Correct Answer: Only light above a certain frequency can cause emission

Solution: 

The photoelectric effect shows that only light above a certain frequency can cause the emission of electrons, regardless of intensity.

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

Practice Questions

Q1
Which of the following statements about the photoelectric effect is true?
  1. Light intensity affects the energy of emitted electrons
  2. Only light above a certain frequency can cause emission
  3. Electrons are emitted regardless of light frequency
  4. The number of emitted electrons is independent of light intensity

Questions & Step-by-Step Solutions

Which of the following statements about the photoelectric effect is true?
Correct Answer: The photoelectric effect shows that only light above a certain frequency can cause the emission of electrons, regardless of intensity.
  • Step 1: Understand what the photoelectric effect is. It is a phenomenon where light can cause electrons to be emitted from a material.
  • Step 2: Learn that not all light can cause this effect. Only light with a frequency above a certain threshold can do so.
  • Step 3: Recognize that the intensity of the light (how bright it is) does not matter if the frequency is below this threshold.
  • Step 4: Conclude that the statement about the photoelectric effect being dependent on frequency, not intensity, is true.
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