1.

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

Answer»

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.



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