Mac and Suzanne cut holes in the bottom of two cups and connect them with a string. When Mac whispers into one cup, Suzanne can hear him through the other. What is the best reason to explain why this happens?

Question

A.
Sound waves can travel great distances.

B.
Sound waves from whispering have a higher frequency.

C.
Sound waves travel better through solids than gases.

D.
Sound waves produce an echo.

Answer 1

C. Sound waves travel better through solids than gases.

When Mac whispers into one cup, the sound waves travel through the string, which is a solid material, and are transferred to the other cup where Suzanne can hear them. Sound waves do travel better through solids than gases because solids are denser and allow for better transmission of vibrations.