The photoelectric effect demonstrates the particle nature of light. (a) In the photoelectric effect, electromagnetic radiation is incident on metal surface. What is the effect of increasing the intensity of the radiation when the frequency is: (i) above the threshold frequency and (ii) below the threshold frequency b) The intensity of light on the metal's surface is measured as 63 W m2.If the wavelength of the light is 340 nm, calculate the number of-photons per second striking one square metre of the metal.