Physics
Grade-8
Easy
Question
The sounds with frequencies smaller than 20 Hz are called _____.
- Ultrasound
- Infrasound
- Super sound
- Supersonic sound
Hint:
Infrasound has frequencies less than 20Hz.
The correct answer is: Infrasound
- Sounds with frequencies less than 20Hz are called infrasound.
- Infrasound is not perceivable by an average human ear.
- So, the correct option is b.
- Sounds with frequencies 20Hz to 20kHz are called audible frequencies.
- Sounds with frequencies more than 20Khz are called ultrasound.
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