Q123 / 160 · AP EAMCET 2020 (18 Sep Shift 2) · Physics

Which of the following statements is correct regarding photoelectric effect? 1. The electrons are emitted if emitting surface is at high temperature. 2. Photoemission occurs if wavelength is less than a critical value. 3. The \(\mathrm{KE}\) of photoelectrons is proportional to the square of the amplitude of incident radiation. 4. The photoelectric current is proportional to the frequency of incident radiation.

  • A
    1
  • Correct answer
    B
    2
  • C
    3
  • D
    4

Solution

When the wavelength of incident radiation on the metal surface is less than threshold (critical) wavelength, then photoelectric emission takes place.

Hence, the correct answer is option: 'B'.

Relevant Questions