Question

A sound wave is passing through air column in the form of compression and rarefaction. In consecutive compressions and rarefactions,

Answer 1

In compression region, the density and pressure of the medium increase.
In rarefaction region, density and pressure of the medium decrease.

Due to compression and rarefaction, density of the medium (air) changes. As density is changing, so Boyle’s law is not obeyed.

The Bulk modulus of medium remains unchanged. The time of compression and rarefaction is too small, i.e. we can assume adiabatic process and hence no transfer of heat.

Final Answer: (d)