Concept:A loudspeaker emits sound, which is a mechanical wave that needs a material medium to travel through air.
Sound propagates as alternating compressions and rarefactions of the medium.
Explanation:When a loudspeaker vibrates, its cone pushes air particles together and then pulls them apart.
These vibrations cause the air particles to oscillate back and forth along the same line as the wave travels.
Because the particle displacement is parallel to the direction of energy transfer, the wave is classified as longitudinal.
Transverse waves, by contrast, vibrate perpendicular to the direction of travel; gamma and radio waves are electromagnetic transverse waves.
Since sound waves are produced by the mechanical vibration of the speaker cone, they are not transverse or electromagnetic.
Thus, the type of wave emitted is a longitudinal sound wave.
Answer:B. Longitudinal