A transverse standing wave is established on a string. Consider the following phase differences.

I. 0°
II. 90°
III. 180°

Which of the following gives all the possible phase differences between the oscillations of any two particles in the standing wave?

A. I only

B. I and III only

C. II and III only

D. I, II and III

B

This question concerned itself with phase difference in a standing wave. It appears not to be well known that particles within any one loop are in phase with each other and that two particles in adjacent loops differ in phase by 180°.