Improvise Telephone

Procedure

1.Provide 2 plastic/paper cup and 1 piece of long string.

2.Cut a small hole on the bottom of the cup.
3.Put in the string to the hole of the cup.
4.Tied the edge of the string.
5.Try it with 2 person.1 is speaking and another one is hearing.Make sure the string is straight not bending.



Conclusion about the sound

The sound can be heard because there os the string the helps to connect and pass through.But if the string bent, the sound can't be heard because the vibration of the string stops.