the speed of ultrasonic waves is 340 m/s and the speed of light and microwaves is 3 × 108 m/s. Ultrasonic waves can be used to measure distances from 1 to about 50 m, whereas the light and microwaves are used to measure longer distances
the speed of ultrasonic waves is 340 m/s and the speed of light and microwaves is 3 × 108 m/s. Ultrasonic waves can be used to measure distances from 1 to about50 m, whereas the light and microwaves are used to measure longer distances