Question

What is the primary source of a sound?

A refraction
A medium to carry the signal
A vibration
A frequency

Answer 1

vibration

Step-by-step explanation:

A sound is the result of a body vibrating in a medium that transmits the energy given off by the body. When a musician draws a bow across the strings of a violin, the strings vibrate and make a sound.

Answer 2

A vibration is the primary source of a sound.