The Frequency Range of Hearing in Humans - Sound | Class 9 Physics

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✅ In this video,

✔️ Class: 9th
✔️ Subject: Physics
✔️ Chapter: Sound
✔️ Topic Name: The Frequency Range of Hearing in Humans - Sound | Class 9 Physics
===============================================
00:00 Introduction
00:06 The Frequency Range of Hearing in Humans
20:27 Website Overview
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Points covered in this video:-

The Frequency Range of Hearing in Humans
The sound produced in our environment have many different frequencies.
The sounds of all the frequencies cannot be heard by the human beings.
For example, if the frequency of a sound is less than 20 hertz, it cannot be heard by human beings.
And if the frequency of a sound is greater than 20,000 he even then it cannot be heard by human beings.
Thus, a human ear cannot hear sound of frequencies less than 20 hertz and more than 20,000 hertz.
The human ear can hear frequency from 20 hz to 20,000 hz is known as the frequency range of hearing in humans.
The sound which we are able to hear is called audible sound.
The sounds of frequencies lower than 20 hertz are known as infrasonic sounds (or just infrasound).
Infrasonic sounds cannot be heard by human beings.
Infrasonic sounds are produced by those objects wh vibrate very slowly.
Earthquake, and some animals like whales, elephants and rhinoceroses also produce infrasonic sounds.
Rhinoceroses communicate with one another by using infrasonic sound having a frequency as low as 5 hertz.
It observed that some animal get disturbed and start running here and there just before the earthquake occur.
This is because, before the main shock waves, the earthquakes produce low-frequency infrasonic sounds which some animals can hear and get disturbed.

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