Question

Longitudinal waves do not exhibit?
a. Refraction
b. Reflection
c. Diffraction
d. Polarization

Answer 1

Hint: Waves are of two types or forms based on the direction of vibration inside it. Oscillations direction can be parallel or perpendicular to the propagation of the wave direction. A wave transports energy without any transfer of any kind of matter. Using the above statement determines what a longitudinal wave does not exhibit.

Complete answer:
The particles are displaced parallel to the direction of propagation of the wave in case of longitudinal waves. A wave vibrating in more than one plane is called an unpolarised wave. Vibrations occur in a single plane in case of a polarised wave. Transforming an unpolarised wave into a polarised wave is known as polarisation. A wave transports energy without any transfer of any kind of matter.
Oscillations direction can be parallel or perpendicular to the propagation of the wave direction. Geometrical orientation of the oscillation can be specified by polarisation of waves. The particles are vibrated in the same direction that the wave travels in case of longitudinal waves. Transverse wave emerges from the polariser vibrating only in one plane.
Transverse wave can only be polarised. Longitudinal waves cannot be polarised. This is because the transverse wave can vibrate in all directions and is perpendicular to the direction of propagation. Hence it is feasible for a transverse wave to continue the vibration in a single plane. But a longitudinal wave vibration is not confined to the plane even though the longitudinal waves vibrate along a single line.

Hence, the correct answer is option (D).

Note: Geometrical orientation of the oscillation can be specified by polarisation of waves. The particles are vibrated in the same direction that the wave travels in case of longitudinal waves. Transverse wave emerges from the polariser vibrating only in one plane. In case of longitudinal waves, they transfer their energy by moving their neighbours in the same direction that the energy moves.