Q1 / 160 · TS EAMCET 2022 (20 Jul Shift 2) · Chemistry

Choose the correct statements in reference to the photoelectric effect. (i) There is no time lag between the striking of light and ejection of electrons from the metal surface. (ii) The number of electrons ejected is independent of the intensity of light. (iii) The elements K, Rb and Cs can show photoelectric effect when exposed to the beam of light.

  • A
    (i) and (ii) only
  • Correct answer
    B
    (i) and (iii) only
  • C
    (i), (ii), (iii)
  • D
    (ii) and (iii) only

Solution

The no. of electrons ejected depends on the no. of photons incidents on the metal surface. The frequency or energy of photon needs to be higher than the threshold frequency or binding energy of the electron

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

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