Q65 of 199 Page 208

The audible range of frequencies of an average human ear is from 20 Hz to 20 kHz. Calculate the corresponding wavelengths. (Speed of sound in air is 344 m s^-1).

λ₁ = v/f = 344/20 = 17.2 m

λ₂ = v/f = 344/20000 = 0.0172 m

What are infrasonic waves? Name two animals which produce infrasonic waves.

What are infrasonic waves? Name two animals which can produce ultrasonic waves.

Define the following terms:

(1) Echolocation

(2) Echocardiography, and

(3) Ultrasonography.

Name an animal which navigates and find food by echolocation.

The audible range of frequencies of an average human ear is from 20 Hz to 20 kHz. Calculate the corresponding wavelengths. (Speed of sound in air is 344 m s-1).