Question

a guitar string is plucked. what best describes the formation and transmission of the sound wave?
the string vibrates the surrounding air, which produces a transverse wave.
the string vibrates the surrounding air, which produces a longitudinal wave.
the string produces a longitudinal wave that travels without a medium.
the string produces a transverse wave that travels without a medium.

Explanation:

Step1: Understand sound wave nature

Sound waves are longitudinal waves. In a longitudinal wave, the particles of the medium (in this case, air) vibrate parallel to the direction of wave propagation.

Step2: Analyze string - air interaction

When a guitar string is plucked, it vibrates. This vibration is transferred to the surrounding air. The air particles then vibrate in the same way (parallel to the wave direction), creating a longitudinal wave.

Step3: Rule out other options

• Transverse waves have particle vibration perpendicular to wave direction. Sound is not transverse, so the first and fourth options are wrong.
• Sound waves need a medium (like air here). So the third option (travels without a medium) is incorrect.

Answer:

The string vibrates the surrounding air, which produces a longitudinal wave.