Which of the following phenomena can be demonstrated by light, but not with sound waves in an air column?
(a) Reflection
(b) Diffraction
(c) Refraction
(d) Polarisation
Correct option: (D) Polarization
Which of the following phenomena can be demonstrated by light. But not with sound waves in an air column?
(A) Reflection
(B) Diffraction
(C) Refraction
(D) Polarization
Which of the following phenomena can be demonstrated by light. But not with sound waves in an air column?
(A) Reflection
(B) Diffraction
(C) Refraction
(D) Polarization
Answer is : (d) Polarisation
Polarisation is a process of alignment of electric vectors (or plane of oscillation of particles) in a particular direction when an electromagnetic wave (or a mechanical transverse wave) passes through a narrow slit. Sound waves in air are longitudinal waves, so they cannot be polarised. Polarisation is shown only by transverse waves.