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Sound — Science STD 9 — Question

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

Answer

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

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