Acoustics involves the study of and the mediums through which they travel.

a. light waves
b. mechanical waves
c. electromagnetic waves
d. gamma rays

The correct option is B.

Explanation:

Acoustic deals with the study of mechanical waves and the mediums through which they travel. It includes sound, infra sound, ultrasound and vibrations.

The mechanical wave is a wave which can travel through a material medium. It can travel through solid, liquid and gases. Sound is the mechanical vibrations of the particles of a gaseous medium.

Therefore, acoustic involves the study of mechanical waves and the mediums through which they travel.

gans

explanation:

vestigial organs (like your appendix) are organs that no longer serve a purpose.

i think the answer is a, hope this : )