Question

What is the best description of sound waves?
1.) A source vibrates up and down, causing air molecules to move up and down perpendicular to the direction the wave is transmitted.
2.) A source vibrates back and forth, causing air molecules to move back and forth in the same direction that the wave is transmitted.
3.) A source vibrates up and down and back and forth, causing air molecules to move in a circular motion as the wave is transmitted.
4.) A source ejects a ring of high-velocity air molecules that travel from the source to a listener.

Answer 1

The 3rd one is the right answer as I studied in school

Answer 2

Answer:

"A source vibrates back and forth, causing air molecules to move back and forth in the same direction that the wave is transmitted".i.e.option(2).

Explanation:

• The sound wave is a longitudinal wave in nature as the sound is produced by the changes in pressure.
• The nature of longitudinal waves is that the particles move back and forth.
• The region where the density of the particle is maximum is called compression and the region where the density of the particle is minimum is called rarefaction.
• Also, these are the waves where the displacement of the medium is in the same direction as the direction of the travel of the wave.

Hence, the beat description of sound wave among the given options is "A source vibrates back and forth, causing air molecules to move back and forth in the same direction that the wave is transmitted".i.e.option(2).

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