17 (a) A student uses a computer for an average of 5 hours every day. The battery supplies a current of 3.5 A to the computer. Calculate how many electrons flow through the computer’s battery in 5 hours.
b) The computer’s screen emits visible light photons with an average frequency of
5.5* 10^14 Hz. The power of the light emitted is 10 W.
Calculate the number of photons emitted per second from the computer screen.
Please can some explain their workign as well