7 Speed Of Sound Lab The Speed Of Sound Was First Measured Using A Cannon Standing On A Hill Some Distance Away From Th 1 (64.96 KiB) Viewed 42 times
7 Speed Of Sound Lab The Speed Of Sound Was First Measured Using A Cannon Standing On A Hill Some Distance Away From Th 2 (37.83 KiB) Viewed 42 times
7 Speed of Sound Lab The speed of sound was first measured using a cannon. Standing on a hill some distance away from the cannon someone measured the time between the flash of the cannon and the following boom. The distance between the hills was known. So to calculate the speed of sound they simple divided the known distance by the time it took the sound to travel that distance. They assumed that light travels so fast that by the time the light from the cannon flash reached their eyes the sound had barely just left the cannon. They could justify using the flash to mark the start of the sound as it traveled from the cannon to their position. Materials: Stopwatch Two pieces of wood (or anything that you can smack together and hear the smack) Procedure: 1. You are going to measure and record the time it takes the sound to travel the given distance. You will need a partner. 2. Stand a good distance (at least 100 m) away from your partner. Going to an outdoor track is ideal for this lab. Measure this distance. 3. Have your partner smack the two pieces of wood together. 4. Start the timer when you see the two blocks hit together 5. Stop the timer when you hear the following "SLAP". It will not be much time! This is why we are repeating this a good number of times. It might take some practice to get the hang of the timing. Distance: 100m Trial 1 2 دیا 4 5 Time (s) 91* 68 43 48 25 Trial 6 7 8 9 10 Time (s) 40 28 33 35 41
Distance: 100m Trial 1 2 3 4 5 Average Time (s) 91* 68 43 48 25 Trial 6 7 8 9 10 36.625 6. Cross out any unreasonable measurements. 7. Calculate the average amount of time it took the sound to travel. (43 +48 + 25 +40 +28+33 +35+41)/8 = 36.625 8. Determine the speed of sound in air Distance/Time - Speed 100 meters/36.625 seconds 2.730 m/s 9. Calculate your percent error for the current air temperature. Time (s) 40 28 33 35 41
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