Physics
Grade-6
Easy
Question
Human ear cannot hear __________.
- Ultrasound
- Infrasound
- Audible sound
- Both a and b
Hint:
The human ear responds to frequencies in the range of 20 Hz to 20,000 Hz
The correct answer is: Both a and b
- The human ear responds to frequencies in the range of 20 Hz to 20,000 Hz (20 kHz),although most speech frequencies lie between 100 and 4,000 Hz. Frequencies above 20,000 Hz are referred to as ultrasonic.
- Infrasound, sometimes referred to as low status sound, describes sound waves with a frequency below the lower limit of human audibility
- So human cannot hear ultrasound and infrasound
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