Sound Waves

• What are sound waves caused by?

  Vibrations
• How do sound waves work in the ear?

  They are funneled into the ear and cause the ear drum to vibrate and other parts of the inner ear to vibrate
• What is the frequency of human hearing?

  20 Hz to 20,000 Hz
• Which state do sound waves travel the fastest in and why?

  Solids - particles are closer together so vibrations can pass more easily between them
• What is ultrasound?

  Sound with higher frequencies than 20000 Hz