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Sound
How is sound produced? How does it travel from one place to another? Draw a diagram also.
Vibrations of the body produce sound. The loudness of the sound depends on the amplitude of vibrations. Once, the body stops vibrating it longer produces ant sound.
Sound requires a medium for propagation. It does not travel in vacuum. Sound waves can travel through air, liquid and even through solids. Air acts a medium for sound propagation and we can hear each other well.
Dolphins and whales communicate in water.
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In the following statements, tick ‘T’ against those which are true, and ‘F’ against those which are false :
State True or False:
If the amplitude of vibration is large, sound is feeble.
For human ears, the audible range is 20 Hz to 20,000 Hz.
State True or False:
The lower the frequency of vibration, the higher is the pitch.
State True or False:
Unwanted or unpleasant sound is termed as music.
State True or False:
Noise pollution may cause partial hearing impairment.
Time taken by an object to complete one oscillation is called __________.
Loudness is determined by the __________ of vibration.
The unit of frequency is ________.
Unwanted sound is called _________.
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