PHYSICS REVISION

PHYSICS REVISION

1. SOUND IS PRODUCED THROUGH THE VIBRATION OF AIR PARTICLES

   • SOUND TRAVELS AS WAVES
     • THE WAVES ARE REFLECTED BY SURFACES
     • IT CAN TRAVEL IN LONGITUDINAL OR TRANSVERSE WAVES
   • THE HARDER YOU HIT A SURFACE THAT PRODUCES SOUND, THE MORE AIR PARTICLES YOU VIBRATE, CREATING A LOUDER NOISE

2. SOUND WAVES TRAVEL AT 343 M/S THROUGH THE AIR

   • THE TRAVEL EVEN FASTER THROUGH SOLIDS AND LIQUIDS

3. YOUR EARS DETECT SOUND WAVES

   • THE VIBRATING AIR PARTICLES CAUSE YOUR EAR DRUM TO VIBRATE
     • LOUDSPEAKERS WORK BY CONVERTING ELECTRICAL ENERGY INTO KINETIC ENERGY
     • • YOU CAN FIND THE SMALLEST BONES IN YOUR BODY ARE IN YOUR EARS
         • THE OSSICLES
       • ANVIL, HAMMER, STIRRUP
       • THE ONLY PART OF THE EAR THAT WE CAN SEE IS THE PINNAR
     • THE EARDRUM IS FOUND IN THE INNER EAR
       • IT IS A THIN MEMBRANE WHICH VIBRATES
         • THE VIBRATIONS ARE THEN PASSED DOWN THROUGH THE OSSICLES TO A SPIRAL STRUCTURE CALLED THE COCHLEA
           • THE COCHLEA IS LOCATED IN THE MIDDLE EAR
             • IT IS FILLED WITH FLUID AND MICROSCOPIC HAIRS.
               • THESE HAIRS CONVERT THE VIBRATIONS INTO ELECTRICAL SIGNALS

4. HARD SURFACES REFLECT SOUND WELL, CAUSING ECHOES

   • SOFT SURFACES LIKE CURTAINS RELFECT VERY LITTLE SOUND AND INSTEAD ABSORB IT

5. SPEED = DISTANCE/TIME

   • D = SPEED x TIME

6. UNDULATION = UP AND DOWN MOVEMENT

7. WHEN TWO WAVES MEET IT IS CALLED SUPERPOSITION

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