You heat 250 ml of tap water from 10 degree celcius to 100 degree celcius in 2 minutes using a microwave oven operating at 2.5 GHz. a). What is the wavelength of this electromagnetic radiation ? b) What is the name given to radiation of this wavelength ? c) How many photons did the cup of water absorb? d) What is the effective power rating of the microwave oven?