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  4. Which of the following phenomena can be demonstrated by light, but not with sound waves in an air column?

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Q. Which of the following phenomena can be demonstrated by light, but not with sound waves in an air column?

KVPYKVPY 2009

Solution:

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.