A microphone is connected to the Y-input of a C.R.O. Three different sounds are made in turn in front of the microphone. Their traces (a), (b) and (c) produced on the screen are shown in the figure.
(i) Which trace is due to the loudest sound? Give reason for your answer.
(ii) Which trace is due to the sound with the lowest pitch? Explain your answer.
(i) (b) is the loudest as its amplitude is largest.
(ii) (a) has the lowest pitch as its frequency is the least.