Question

356 | H. M. Science For Class 9
11. Classify sound waves on the basis of frequency range.
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Answer 1

Answer:

Classification of the sound waves: -

The most common form of ranking is related to the oscillation frequency. So we can talk about:

Infrasounds: those oscillations with a frequency less than 20 Hz (not perceptible by humans).

Audible Sounds: between 20 and 20.000 Hz.

Ultrasounds: over 20.000 Hz. Also unnoticeable.

These frequency ranges vary between individuals. These values are average values.

Answer 2

Answer:

Infrasonic waves have frequencies below 20 Hz, which makes them inaudible to the human ear. Scientists use ..

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