Question

Take two paper cup and join ihem by 10-15 meter long thread and talk to each other according
to given image. How do you hear? Write your experience.
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Answer 1

Explanation:

Its a physical and mechanical way of hearing it depends on the breadth and thickness of the thread

if the velocity is of thread is more then you can hear but there is a condition. The volume and the velocity of the paper cup should match the breadth of the thread