sound

sound

1. speed

   • speed of sound =
     • speed=distance/time
     • distance=twice the distance from object

2. can not be heard in space

   • as no particles to let the sound travel on (vacuum)

3. can travel through; solids, liquids and gases

   • travels through solids the best

4. vibration in engine and in air inside exhaust

   • vibration in air
     • vibration in eardrum
       • vibration in bones
         • vibrations in liquid cochlea
           • electrical messages in nerve

5. humans hear from 20Hz - 20 000Hz

   • but bats have the highest range of hearing (for ultrasound)

6. pitch

   • the pitch is how close together the sound waves are
     • it also determines how high or low the sound is
   • measured in Hz

7. volume

   • this is how high or low the length of the waves are from the base line
     • it how loud or quiet the sound is

8. is made by an object vibrating the air molecules to then be picked up by the human ear

9. waves

   • these determine the pitch and volume of the sound
   • can be demonstrated on a slinky
   • measured in m

10. Calculating the speed of sound

    • distance = *2 twice the distance to return to your ear
    • eg
      • 2d
        • t
        • 515*2
          • 3
          • 1030
            • 3
            • = 343.3recuring