10: Beyond human senses sound

Question 1

range of human sound

Answer 1

Humans can hear sounds with a range of frequencies (20Hz - 20000Hz).

Question 2

what is sound that humans cannot hear called?

Answer 2

Sounds that cannot be heard by humans are called infrasound and ultrasound.

Question 3

what is infrasound

Answer 3

Infrasound has frequencies lower than 20 Hz.

Question 4

waht is ultrasound

Answer 4

Ultrasound has frequencies higher than 20000 Hz (20 kHz).

Question 5

what communicate using infrasound

Answer 5

Elephants and big animals communicate using low frequency (low pitch) infrasound.

Question 6

what animals uses ultrasound

Answer 6

Bats and dolphins emit high frequency (high pitch) ultrasound waves and navigate using echolocation .

Question 7

uses of ultrasound

Answer 7

.Medicine
. giving clear images of unborn fetus and internal organs.

. vibrations of ultrasound used to break up masses eg, kidney stones well .cleaning jewellery
.tenderising meat.

Question 8

uses of infrasound

Answer 8

.Infrasound occurs naturally

.Infrasonic detection sensors are used worldwide by the military and scientists to detect earthquakes and meteors.