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Question

Which of the following is true about the speed of sound?

A
It decreases with the density in medium.
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B
It is the highest for objects in solid state.
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C
It increases from solid to gaseous state.
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D
It is independent of the medium of propagation.
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Solution

The correct option is B It is the highest for objects in solid state.
The speed of a sound wave depends on the characteristics of the medium of propagation. It is the highest in denser media like solids. Hence, when sound travels from solids to liquids or gaseous medium, its speed decreases.
Sound travels at 343 m s1 in air; it travels at 1,484 m s1 in water (4.3 times as fast as in air) and at 5,120 m s1 in iron (about 15 times as fast as in air) .

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