Riddles about Sound

Think about the following riddle: If a tree falls in a forest and no one is there to hear it, does the falling tree make a sound? Must you hear a vibration for it to be sound? Is the energy produced by the vibration a sound if no one hears it? The falling tree

Develop your own definition for sound. Sound is

What is a medium?

Explain in your own words how elasticity affects the speed of sound waves.

How could you use this information to describe what happens when you talk to a friend under the water in a pool and above the water in a pool?

Why does the sound travel faster in a solid medium?

For both of the graphs above, give an example of real life sounds that could make the two graphs.

The quieter noise could be made by...

The louder noise could be made by...

Which wave is the loudest?