4 questions · timed · auto-graded
Explanation:
The speed of sound in a vacuum is zero meters per second, as sound cannot travel in a vacuum. Sound is a wave, which means it spreads through the vibration of particles in a medium, such as water or air.
Explanation:
Ultrasonic Testing (UT) uses high frequency sound energy to conduct examinations and make measurements. Ultrasonic inspection can be used for flaw detection/ evaluation, dimensional measurements, material characterization, and more.
Explanation:
They can't hear an echo in small room because in it the sound can't be reflected back. For an echo of a sound to be heard, the minimum distance between the source of sound and the walls of the room should be 17.2m. Obviously, in a small room echoes cannot be heard.