Answers

2016-02-20T11:51:21+05:30
Activity:
The troy telephone activity in which 2 tins are connected by a thread.If a child speaks into 1 tin,he can be heard by another child who puts his ear to the other tin.In this case the sound vibrations are transmitted by the thread,which is a solid.
Therefore, we can say that sound needs a material medium to travel....
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