The sound waves emitted by three sources A, B and C are represented in Fig. Class 9

The sound waves emitted by three sources A, B and C are represented in Fig. Class 9

Question 1.

The sound waves emitted by three sources A, B and C are represented in Fig. If the frequency of A is maximum and C is minimum, identify the corresponding curves, and mark A, B and C on them. Class 9

Answer:

Frequency is inversely related to wavelength (v = λv, speed is constant).

1. Higher frequency → shorter wavelength (more crests per unit distance).
2. Lower frequency → longer wavelength (fewer crests per unit distance).

From above given Fig. (three overlapping curves):

1. A (maximum frequency) → the curve with the shortest wavelength (most closely spaced crests).
2. C (minimum frequency) → the curve with the longest wavelength (most widely spaced crests).
3. B → the curve with wavelength between A and C.