Read the following statements about the photoelectric effect:
- The kinetic energy of emitted photoelectrons increases with increasing intensity of incident light.
- The photoelectric effect demonstrates the particle nature of light.
- There is a threshold frequency below which no photoemission occurs, regardless of light intensity.
Which of the above statements are correct?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. 2 and 3 only.
The first statement is incorrect because the kinetic energy of emitted photoelectrons depends on the frequency of incident light, not its intensity. Increasing intensity only increases the number of emitted electrons, not their energy.
The second statement is correct as the photoelectric effect supports the particle nature of light, where light behaves as photons carrying discrete energy.
The third statement is also correct since there exists a threshold frequency; below this, electrons are not emitted regardless of how intense the light is.