Which best explains why sound travels fastest through a solid? a. sound is a mechanical wave, so closer molecules in the medium cause energy to transfer faster. b. sound is a mechanical wave, so if the volume of the medium is greater, more energy is transferred. c. sound is an electromagnetic wave, so the medium does not affect the speed. d. sound is an electromagnetic wave, so a greater amplitude results in a greater speed.

A. Sound is a mechanical wave, so closer molecules in the medium cause energy to transfer faster.

Explanation:

There are two types of waves:

- Mechanical waves: these waves are transmitted through a medium, caused by the vibrations of the particles in the medium, and they propagate through the collisions of the particles in the medium

- Electromagnetic waves: these waves are produced by the oscillations of electric and magnetic fields, and they do not need a medium to propagate

Sound is a mechanical wave, which means it is transmitted through the vibrations of the particles of the medium (which can be gas, liquid or solid). When the particles in the medium are closer, sound is transmitted faster, because more collisions between molecules occur. Therefore, the correct answer is

A. Sound is a mechanical wave, so closer molecules in the medium cause energy to transfer faster.

causes

fossil fuels burn

cities become more industrialized

human population grows worldwide