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.

The diagram below shows three different modes of vibration P, Q and R of the same string of a given length.

(a) Which vibration will produce a louder sound and why?

(b) Which vibration will produce sound of maximum shrillness (or pitch) and why?

(c) What is the ratio of the wavelength of vibrations P and R?

Draw a diagram to show the wave pattern of high pitch note and a low pitch note, but of the same loudness.

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