Sounds having frequencies lower than 20 Hz are called-A- Ultrasonic soundB- Audible soundC- Infrasonic soundsD- Periodic vibrations

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Standard VIII

Physics

Audible and Inaudible Sounds

Sounds having...

Question

Sounds having frequencies lower than 20 Hz are called:

Ultrasonic sound

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Audible sound

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Infrasonic sounds

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Periodic vibrations

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Solution

The correct option is C
Infrasonic sounds

Sounds having frequencies lower than 20 Hz are below audible level and hence are called infrasonic sound.

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Similar questions

Q. Sounds of frquency above

20 k H z

is called:

Sound waves whose frequency is greater than 20000 Hz is called ___.

What is : periodic time, simple harmonic motion , wave, wave length, amplitude, frequency, wave velocity, audible sound, infrasonic sound, ultrasonic sound, echo and reverberation

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)

Q. What are the differences between infrasonic, audible and ultrasonic sound waves?

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Sounds having frequencies lower than 20 Hz are called:

The correct option is C Infrasonic sounds Sounds having frequencies lower than 20 Hz are below audible level and hence are called infrasonic sound.

The correct option is C
Infrasonic sounds

Sounds having frequencies lower than 20 Hz are below audible level and hence are called infrasonic sound.