Question

Sarah and Maria made a telephone using two cans and a string. They pulled the string tight and Maria went out into the hallway. When Maria spoke into her can, Sarah could hear her because the sound waves
Responses
A travelled through a vacuum.travelled through a vacuum.
B travelled from the cold hallway to the much warmer classroom.travelled from the cold hallway to the much warmer classroom.
C travelled from the vibrating can through the string to the other can.travelled from the vibrating can through the string to the other can.
D travelled through the air from Maria to Sarah even though they were in different places.travelled through the air from Maria to Sarah even though they were in different places.

Answer 1

C

The speaker's voice makes her can's bottom vibrate; those vibrations set the taut string into mechanical (longitudinal) waves which travel along the string to the other can, making it vibrate and produce sound.