The distance which compression or a rarefaction travels per unit of time gives————-

Correct option is B

Ans.(b) Speed of sound

Explanation:
The correct answer is Speed of Sound. The distance traveled by a compression or rarefaction per unit time in a sound wave represents its speed. It is given by:

$$v=f\lambda$$

where,
$v$ = speed of sound,
$f$ = frequency,
$\lambda$ = wavelength.

Information Booster:
● Sound travels fastest in solids, followed by liquids and slowest in gases.
● The speed of sound in air (at 20°C) is 343 m/s.
● Sound requires a medium to travel, unlike light.
● Humidity increases sound speed in air.
● Temperature also affects sound speed.
● Sound waves are longitudinal waves, moving via compression and rarefaction.