Which material is a pure substance A
Alloy B compound C mixture D solution?

compound

Explanation:

they are basically a 1 type atom, that can be broken down

or decomposed.

there's the proffessional site that will you.

when the displaced particles are perpendicular to the direction the wave travels, is called a transverse wave, whereas in longitudinal wave the displace practices are parallel to the direction of the wave.

in the given image:

first image shows - longitudinal wave

second image shows - transverse wave

third image shows - longitudinal wave

fourth image shows - longitudinal wave