Which of the following statement(s) is/are incorrect regarding photoelectric effect? (1) The number of electrons ejected is proportional to the intensity of light. (2) There is some time lag between the striking of light beam on the metal surface and the ejection of electrons. (3) The kinetic energy of ejected electrons depends upon the brightness of light. (4) The kinetic energy of the ejected electron is proportional to the frequency of the incident radiation.