least louder sound produced by
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Sounds is produced by vibrating objects . We hear a variety of sounds in surroundings.Some Key points to remember
1) In human beings, the vibration of the vocal cords produces sound .
2) Unpleasant Sounds are called noise .
3) The eardrum senses the vibrations of sound, it sends the signal to brain . This process is called hearing .
4) The frequency is expressed in Hertz (Hz).
5) Plantation on the roadside and elsewhere can reduce noise pollution.
6) Attempts should be made to minimize noise Pollution.
7) Sound travels through a medium ( gas , liquid or solid ) . It cannot travel in a vacuum.
8) Higher the frequency of vibration, the higher is the pitch and shriller is the sound .
9) Excessive or unwanted sounds lead to noise pollution. Noise
pollution may pose health problems for human beings.
10)
1) In human beings, the vibration of the vocal cords produces sound .
2) Unpleasant Sounds are called noise .
3) The eardrum senses the vibrations of sound, it sends the signal to brain . This process is called hearing .
4) The frequency is expressed in Hertz (Hz).
5) Plantation on the roadside and elsewhere can reduce noise pollution.
6) Attempts should be made to minimize noise Pollution.
7) Sound travels through a medium ( gas , liquid or solid ) . It cannot travel in a vacuum.
8) Higher the frequency of vibration, the higher is the pitch and shriller is the sound .
9) Excessive or unwanted sounds lead to noise pollution. Noise
pollution may pose health problems for human beings.
10)
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