.A resonating column of air contains*1 point(a) Stationary longitudinal waves(b) Stationary transverse waves(c) Transverse progressive waves(d) Longitudinal progressive waves

The correct answer is (a) Stationary longitudinal waves.

Here's why:

A resonating column of air is a system that produces sound by creating vibrations in the air. These vibrations are in the form of waves.

There are two main types of waves: longitudinal and transverse.

Longitudinal waves are waves in which the displacement of the medium is in the same direction as, or the opposite direction to, the direction of propagation of the wave. Sound waves in air are longitudinal waves.

Transverse waves are waves in which the displacement of the medium is at right angles to the direction of propagation of the wave. Light waves are an example of transverse waves.

In a resonating column of air, the waves are longitudinal because the air particles are displaced along the direction of the wave.

Furthermore, these waves are stationary or standing because they are confined within the column of air. They are not progressive waves, which move outwards from the source.

So, the correct answer is (a) Stationary longitudinal waves.