Question

11.What is an ultrasonic sound?

12. What is vibration?

13. Define the following terms.(a). Amplitude (b). Loudness​

Answer 1

a - Ultrasonic wave is defined as “inaudible sound with high frequency for human” the frequency of which generally exceeds 20 kHz.

b - The definition of a vibration is a movement back and forth, or an emotion sensed by another person. An example of a vibration is the feeling of two cymbals being slammed together.

c - Amplitude, in physics, the maximum displacement or distance moved by a point on a vibrating body or wave measured from its equilibrium position.

d - Loudness is not simply sound intensity! Sound loudness is a subjective term describing the strength of the ear's perception of a sound.