Complete the following sentence. Sound cannot travel through ……………, but it requires a …………. .

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Air, medium

Water, medium

Solids, medium

Vacuum, medium

answer is D.

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Detailed Solution

Concept- Mechanical waves of the sort that travel exclusively in the presence of a medium include sound waves. On the moon, you cannot hear the explosion. The medium with the densest packing of molecules has the fastest sound speed.
Now let's talk about sound, which is a type of wave. A solid, liquid, or gas must be present for sound waves to pass through. Each of these media is permeable to sound waves because they cause the molecules in the material to vibrate. In solids, the molecules are closely clustered. Solids and liquids are not packed as tightly. Additionally, the gas is packed quite loosely. Since molecules are spaced apart, sound may pass through solids even more quickly than through glasses. Sound flows about four times faster and deeper in water than it does in air. Sound waves are moving particles in a medium like the air, water, or metal. It seems to make sense that they cannot go into empty space, since either atoms or molecules can vibrate.
Let's talk about a fascinating truth. Sound does not move at all in a vacuum. There is almost no air in outer space. Since sound is nothing more than air vibration, there is no sound in a vacuum since there is no air to vibrate. If another spaceship exploded while you were aboard your own rocket ship, you wouldn't hear it. So, it follows from the reasoning above that sound cannot travel through a vacuum and needs a medium.
Hence, the correct option is 4.

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