Explain the working and construction of electric bell along with diagram and also give it principal
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Explanation:
experiment to show that sound need a material medium for its propagation is given below .
take an electric bell and and airtight glass Bell jar . the electric wale is suspended inside the airtight Bell jar .
the bell jar is connected to a vacuum pump as shown in figure . if you press the sweet you will be able to hear the bell . Now , start the vacuum pump . When the air in the jar is pumped out gradually the sound become fainter , although the same current is passing through the bell. After sometime when less air is left inside the bell jar, you will hear a very feeble sound. On removal of of complete care no sound is heard.
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