The number of photo-electrons emitted per second from a metal surface increases when

  • A
    The energy of incident photons increases
  • B
    The frequency of incident light increases
  • C
    The wavelength of the incident light increases
  • D
    The intensity of the incident light increases

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For the reactions:
$2NO + O_2 \rightleftharpoons 2NO_2 ; K_1$
$4NO + 2Cl_2 \rightleftharpoons 4NOCl ; K_2$
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