The distance travelled by a pulse per unit of time is called:A Time period B Pulse speed C Wavelength D Frequency

To analyze the options provided for the definition of the distance travelled by a pulse per unit of time, let’s break down the concepts associated with each term:

1. Time period (A): The time taken for one complete cycle of the wave. It does not represent speed.

2. Pulse speed (B): This refers to the speed at which a pulse travels through a medium, defined as the distance travelled by the pulse divided by the time taken. This matches the definition provided.

3. Wavelength (C): The distance between consecutive crests or troughs of a wave. It does not describe speed.

4. Frequency (D): The number of cycles of a wave that pass a point in one second. It is inversely related to the time period, but does not measure distance directly.

Conclusion

The correct answer is B. Pulse speed, as it defines the rate at which the pulse moves through a medium, which corresponds to the distance travelled per unit of time.