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How Sound Propagates!

Wave is produ...

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Wave is produced when there is a disturbance in the medium but light as a non mechanical wave can travel in vacuum . HOW?

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Q. How does a non-mechanical wave propagate without a medium?

Complete the following sentences :

(a) Sound can not travel through ___, but it requires a ___ .

(b) When sound travels in a medium, the particles of medium ___ but the disturbance ___ .

(c) A longitudinal wave is composed of compression and ___ .

(d) A transverse wave is composed of crest and ___ .

(e) Wave velocity = ___ x wavelength.

Q. A light wave can travel
(a) in vacuum
(b) in vacuum only
(c) in a material medium
(d) in a material medium only

Q. Assertion :Sound waves cannot travel in vacuum but light can travel in vacuum. Reason: Sound waves are longitudinal waves and they cannot be polarised but electromagnetic waves are transverse and they can be polarised.

Q. Following statements which are true for light waves but not for sound waves are/is

(I) The speed of waves is greater in vacuum than in a medium
(II) Waves of different frequencies travel with different speeds in a medium
(III) Waves travel with different speeds in different media.

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