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The sound of distant horses can be heard...

The sound of distant horses can be heard by applying the ear to the ground whereas it is inaudible if the ear is held a little distance above the ground. Explain.

Text Solution

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We know that loudness is directly proportional to the density of the medium. The density of ground is much higher than that of air. Thus, the sound of distant horses, when conveyed through ground, is louder then when through air. Therefore, by applying ear to the ground, we can hear this sound. But when the ear is a little distance above the ground, the sound travels though air and is hardly audible. A part from it, velocity of sound in solid (like ground) is more so ground facilitates transfer of sound energy with greater intensity.
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Knowledge Check

  • If one puts ones ears to the steel rail, the sound of a coming train can be heard even when the train cannot be seen. One can conclude from this observation that (1) sound travels faster in steel than in air. (2) amplitude of sound in the rail is much larger than in air. (3) sound can travel larger distances in solids than in air. (4) quality of sound in rail is better than in air. The reasonable conclusions are

    A
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    B
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    C
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    D
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