18. (a) 'Vibrations cause sound. But we do not always get a sound whenever there are some vibrations.' Describe an activity to justify this statement.
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Answers
I can't show you an activity.
But if a object it vibrating with lower frequency than 20Hz, then wee are unable to hear it.
Therefore some thing that are vibrating with with low frequency, produce sound bt we are unable to hear that.
Answer:
Answer
Tuning Fork
A fork consists of two tines and a handle. When it is hit with rubber hammer, the two tines starts vibrating. The back and forth motion of tines produces disturbances in the surrounding air molecules. As the tines extend outward from their original position, they compress surrounding air molecules which results in the creation of high-pressure region close to the tine. When the tine moves inwards, it produces a low pressure region near the tine. With more vibrations of tine, an alternating pattern of high and low pressure regions are created. These pressure difference regions help in propagation of sound waves from one location to another
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