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Perception of Sound

The range of ...

Question

The range of infrasonic vibration is in between

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Solution

Audible range for the human ear is between $20 H z t o 20000 H z$
Sound below $20 H z$ is infrasonic and above $20000 H z$ are called ultrasonic sound
Hence, the range of infrasonic vibration is between $0 t o 20 H z$ .

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Infrasonic frequency range is

Write the audible, infrasonic & ultrasonic frequency range.

Q. (a) What are infrasonic waves ? Name two animals which produce infrasonic waves.
(b) What are ultrasonic waves ? Name two animals which can produce ultrasonic waves.
(c) 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 ms^–1)

Complete the following sentences :

(a) An average person can hear sound of frequencies in the range ___ to ___.

(b) Ultrasound is of frequency ___ .

(c) Infrasonic sound is of frequency ___ .

(d) Bats can produce and hear ___ sound.

(e) Elephants produce ___ sound.

Q. Match the pairs

Group 'A' Group 'B'

(a) Flute (1) Frequency less than 20 Hz

(b) Frequency (2) Frequency more than 20000 Hz

(c) Sound level (3) Vibrations in the air

(d) Ultrasonic sound (4) Measured in Hz

(e) Infrasonic sound (5) Decibel

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