The term compression describes the part of the wave shown in the figure, therefore the correct answer is option A.
What is a sound wave?
It is a type of mechanical wave composed of the disturbance caused by the movements of the energy. A sound wave travels through compression and rarefaction in an elastic medium such as air.
Sound waves are longitudinal waves while electromagnetic waves are transverse waves, the speed of the sound very much depends on the medium of travel as well as the temperature of the medium.
The mathematical expression for the speed of the sound in air is given by
v= √γRT
where v is the speed of the sound
R is the ideal gas constant
T is the temperature
γ is the adiabatic index
The speed of sound in air at 0° Celcius is 330 m/s.
As we know that sound waves are composed of compression and rarefaction, hence compression describes the part of the wave shown in the figure, therefore the correct answer is option A.
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