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Sound — Science STD 9 — Question

Maharashtra BoardEnglish MediumSTD 9ScienceSound2 Marks
Question
What is the difference between infrasonic waves and ultrasonic waves?
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Answer

Infrasonic waves Ultrasonic waves
These include of frequencies below 20Hz. These include sounds of frequencies above 20,000Hz.
These sounds are produced by objects vibrating very slowly. These sounds are produced by objects vibrating very rapidly.

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