Q87 / 120 · VITEEE 2014 · Physics

A metallic surface ejects electrons. When exposed to green light of intensity I but no photoelectrons are emitted,when exposed to yellow light of intensity I.It is possible to eject electron from the same surface by

  • Correct answer
    A
    yellow light of same intensity which is more than I
  • B
    green light of any intensity
  • C
    red light of any intensity
  • D
    None of the above

Solution

$\lambda_{\text {red }}>\lambda_{\text {violet }}$ As wavelength $\lambda$ less than that of yellow colour and hence can initiate photoelectric effect irrespective of intensity.

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

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