CBSE Class 8 Answered
what is sound
Asked by ajitraba73 | 30 Jan, 2018, 07:25: PM
Expert Answer
Sound is a form of energy that propogates in a medium as longitudinal mechanical vibrations with frequencies from 20 Hz to 20000 Hz, which is typical range of human hearing. The branch of physics that deals with the study of sound is called acoustics. Though human hearing is limited to the range 20 Hz to 20000 Hz, Acoustics involves study of all frequency range. Sound of frequency above 20000 Hz is called ultrasonic sound used in medical imaging and under water study. Sound of frequency below 20 Hz is called infrasonic that occurs in sesimic events and earth quakes.
Answered by Thiyagarajan K | 30 Jan, 2018, 07:56: PM
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