science
Grade6
Easy
Question
Sounds of 15 Hz frequency are called _______.
- Ultrasound
- Infrasound
- Audible sound
- None
Hint:
Infrasound are the Sounds below 20Hz frequencies
The correct answer is: Infrasound
- Sounds below 20Hz frequencies are called infrasound.
- Hearing becomes gradually less sensitive as frequency decreases, so for humans to perceive infrasound, the sound pressure must be sufficiently high
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