1.Differences between radiations and specific heat 2.Differences between conduction convection and convection current

3.Differences between thermal conductor and thermal insulator

4.Temperature is between thermal expansion and thermal contraction

5.Differences between radiation and vacuum

i might be wrong but i think its a. let me know if i’m right and have a good rest of your day!

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