Question

a) What are infrasonic waves? Name two animals which produce infrasonic waves
b) What are ultrasonic waves? Name two animals which can produce infrasonic waves
c) The audible range of frequencies of an average human ear is from 20 Hz to 20,000
KHz.Calculate the corresponding wavelengths.( speed of sound in air is 344 m/s)​

Answer 1

Explanation:

the frequency of the sound which is more than 20000 hertz it is called infrasonic sound

that produces the infrasonic sound during the night during hinting

Answer 2

(a) It is inaudible because its frequency is smaller than the human audible frequency range (20 Hz–20 kHz). Whales and elephants are capable of producing such sounds.

(b) This is inaudible, because its frequency is above the audible frequency. These sounds can be made by dolphins and bat.

(c) Therefore, in audible area the wavelength range is 17.2 m − 0.0172 m.

Explanation:

(a) Infrasonic waves of sound have frequencies lower than 20 Hz. It is inaudible, because its frequency is smaller than the human audible frequency range (20 Hz–20 kHz). Such sounds are created very slowly by vibrating objects. Whales and elephants are capable of producing such sounds.

(b) The waves of ultrasonic noise have frequencies greater than 20 kHz. This is inaudible, because its frequency is above the audible frequency range of humans (20 Hz–20 kHz). Such sounds are created very quickly by vibrating objects. These sounds can be made by dolphins and bat.

(c)

STEP:1 We have to calculate the wavelength range of audible sound.

STEP:2 Given values in the question

Low frequency $F_{L}$ = 20 Hz

High frequency $F_{H}$ = 20,000 Hz

Sound speed ν = 344 m/s

STEP:3 We know that

λ = $\frac{v}{f}$

STEP:4 So, the wavelength of lower frequency is

λ$_{L} = \frac{344}{20}$ = 17.2 m

STEP:5 So, the wavelength of higher frequency is

λ = $\frac{344}{20000}$ =0.0172 m

STEP:6 Therefore, in audible area the wavelength range is 17.2 m − 0.0172 m.

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