distance between the vibration source and the receiver. type of material through which the sound travels. size of the object making the sound. type of device making the sound.
I gave my students this multiple choice question: The speed at which sound waves travel depends on the

Only one answer is correct among these 4 choices:
- distance between the vibration source and the receiver.
- type of material through which the sound travels.
- size of the object making the sound.
- type of device making the sound.

Could you tell me which one is correct?

type of material through which the sound travels.