Question

what is a longitudinal wave? state two differences between music and noise.

Explanation:

(i) A longitudinal wave is a wave in which the particles of the medium vibrate parallel to the direction of wave propagation. For example, sound waves in air are longitudinal waves.
(ii) Music is a pleasant - sounding combination of sounds with a regular pattern and specific frequencies. Noise is an unpleasant, irregular, and random combination of sounds with no definite pitch or pattern.

Answer:

(i) A wave where medium - particles vibrate parallel to wave propagation.
(ii) Music is pleasant and has a regular pattern; Noise is unpleasant and random.