What is Velocity?

• A. Rate of loudness
• B. Speed of the light
• C. Speed of sound
• D. Attenuation

Answer: (C)

Velocity is the rate at which something changes position over time, essentially how fast something moves and in what direction. When we discuss how quickly a disturbance travels through a medium, we’re talking about the velocity of that disturbance. For sound traveling through air, that velocity is the speed at which the sound wavefront moves—what we commonly call the speed of sound. Among the given options, the best fit is the speed of sound because it directly describes how fast a wave propagates through a medium. The other ideas describe aspects unrelated to motion through space: how loud something is (intensity or loudness), the attenuation (loss of signal strength), or a universal constant like the speed of light, which isn’t about the propagation of a sound wave in this context.