Which of the following statements are correct?

(i) Sound is produced by vibrations.

(ii) Sound requires a medium for propagation.

(iii) Light and sound both require a medium for propagation.

(iv) Sound travels slower than light.

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(i) and (ii) only

(i), (ii) and (iii) only

(ii), (iii) and (iv) only

(i), (ii) and (iv) only

answer is C.

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Detailed Solution

The correct statement are sound requires a medium for propagation, and the medium are sound and light, and travels slower than light.
A sound wave cannot propagate through a vacuum because it needs a medium for its propagation. Sound is a mechanical wave which needs a medium for its propagation. It can travel through a material medium like air, water, iron rods, wires etc. sound travels faster in solid than liquid. And it travels faster in liquid than in gases. Sound cannot travel through a vacuum as it needs a medium. The loudness of sound may increase or decrease with the medium of propagation.

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