Physics
Grade-8
Easy
Question
The frequency of vibration of an object is 15 Hz. A person ____ hear it.
- Cannot
- Can
- Sometimes can
- Always can
Hint:
Audible range is 20Hz-20kHz
The correct answer is: Cannot
- Audible range of frequency for an average human ear lies between 20Hz to 20kHz.
- Therefore, the frequency of 15Hz can't be perceived by the human ear.
- So, the correct option is a.
- Sounds with frequencies below 20Hz are called infrasound.
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