How does the two sounds of the same loudness and same pitch produced by different instruments differ? Draw diagrams to illustrate your answer.

Two musical notes of the same pitch and same loudness are played on two different instruments. Their wave patterns are as shown in figure below.

Explain why are the wave patterns different.

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 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.

In what respect does the wave pattern of a noise and music differ? Draw diagram to explain your answer.