Pulse duration is directly proportional to which factors?

Pulse duration refers to the time it takes for one pulse of sound to travel through the medium, and it is defined as the product of the number of cycles in a pulse and the period of each cycle. By being directly proportional to the number of cycles, it indicates that a longer pulse (more cycles) will inherently take more time to complete than a shorter pulse.

In this context, as the number of cycles increases, the duration of the pulse increases as well, which makes sense because more cycles mean that the sound wave is oscillating more times within that pulse.

In terms of the other options, pulsed wave frequency (which is inversely related to pulse duration), amplitude of sound (which affects intensity but not duration), and transmission efficiency (which pertains to how effectively the sound is transmitted rather than the time it takes for the pulse to occur) do not directly impact pulse duration in the same way that the number of cycles does. Hence, the correlation of pulse duration is specifically tied to the number of cycles present within that pulse.