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Chapter 10 Sounds Waves: Characteristics and Applications - Part 1

What are sound waves with frequencies below 20 Hz called?

Type: MCQ • Marks: 1
What are sound waves with frequencies below 20 Hz called?
Options
A. Ultrasonic sound
B. Supersonic sound
C. Infrasonic sound (Infrasound)
D. Audible sound
Explanation
Infrasound refers to acoustic waves below 20 Hz, produced by earthquakes or whales.
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Class 9th Science (MCQ)

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