Question

Q15.11 Children make toy telephones by sticking each end of a
long string through a hole in the bottom of a paper cup and knot-
ting it so it will not pull out. When the spring is pulled taut, sound
can be transmitted from one cup to the other. How does this work?
Why is the transmitted sound louder than the sound traveling
through air for the same distance?
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Answer 1

Answer:

Sound waves are basically vibrations.

This works as the vibrations from our mouth is gathered in our paper cup and is transferred through the string to the next paper cup.The person holding this cup in their ear receives the vibrations and hear the sound.

The intensity of sound is directly proportional to the density of medium as is vibrations.

Denser the media,stronger the vibrations, louder the sound.

Definitely,the string is denser than air,so it is louder.