Speaking into the cup creates s....... waves which are

converted into v............ at the bottom of the cup.

The vibrations travel along the s.............. and

are converted back into sound waves a... the other end

so your friend can h......... what you said.

Sound travels through the a.......

but it travels even better through s......... such as your cup and string

allowing you to hear sounds that might be too far a..........

when traveling t............ the air.