A(n) ___ operates by sending sound waves toward a target and measuring the time it takes for the pulses to bounce back.

A) pressure sensor
B) bar code scanner
C) ultrasonic sensor
D) flowmeter

Sound Waves

Mechanical vibrations that travel through a medium such as air, water, or solid materials, and can be heard when they reach a human or animal ear.

Pulses

Rapid, transient changes in the amplitude of an electrical signal, often used to convey information or trigger specific actions in electronic devices.