Sound

Question 1

How is sound produced?

Answer 1

Sound is produced by vibrating sources. Sound waves propagate by causing layers of air around it to displace.

Question 2

(Practical) Investigating sound in a vacuum:

Answer 2

1. Place a bell and a striker into a sealed bell jar.
2. Turn the bell on and turn the vacuum off (sound produce)
3. Do the inverse (Sound stops)

Question 3

What is an echo?

Answer 3

Echoes are reflections of sound waves. They are formed when sounds are reflected off hard, flat surfaces