Question

Humans can detect sound vibrations between ________ and ________ cycles per second.

1) 30; 700
2) 25; 4,000
3) 30; 20,000
4) 25; 9,000
5) 300; 45,000

Answer 1

Humans are capable of detecting sound vibrations in the range of 20 to 20,000 Hz, stretching from infrasound to the threshold of ultrasound.

Step-by-step explanation:

Humans can detect sound vibrations between 20 and 20,000 cycles per second (hertz, Hz). Normal human hearing encompasses this impressive range of frequencies where sounds below 20 Hz are termed as infrasound and those above 20,000 Hz are referred to as ultrasound. The frequencies that humans are capable of hearing can be affected by a variety of factors, including age and the ability to discern pitch, which is directly related to frequency.