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  • 1. L
  • 2. GROUP MEMBERS NOR FAZREENA BINTI MA’AMOR (D20101037526) NURSYAKHILA BINTI ZAHARI (D20101037523) AYU NADIA BINTI MOHD ZAHID (D20101037528)
  • 3. SPEED OF SOUND This experiment describes the use of the ADC -212 virtual oscilloscope to measure the speed of sound.
  • 4. SPEED OFSOUND..
  • 5. Scientific concept : The speed of sound is the distancetravelled during a unit of time by a soundwave propagating throughan elastic medium. In common everyday speech, speed ofsound refers to the speed of sound wavesin air. However, the speed of sound variesfrom substance to substance. Soundtravels faster in liquids and non-porous solids than it does in air.
  • 6. Last weekend, my family decide to go to GuaKelam in Perlis. As we walk through the cave thereis a lot of nice things to watch. Then, I noticesomething interesting, when we talk in the cave, wecan hear our voice be reflect. We hear our ownvoice echo. Why this happened? I also notice thesame phenomena occur when I talk in empty houseor when I shout in the tunnel. How can this happenand what is the cause?
  • 7. EMPOWEREquipment required2 microphones-crystal Mics were used since they are cheap and give a large output1 metre wooden ruleFast digital storage oscilloscope-the ADC-212 was usedA balloon-to burst for a sudden loud sound source
  • 8. Experiment set upThe experiment was set up as shown below with two crystal microphones placed 1 metre apart
  • 9. Results : The balloon was burst approximately 2 m away from the foremost Mic. The plot below shows the results clearly. The lefthand “BLUE” trace is from the fpremost Mic (Mic 1) and the righthand “red” trace is from mic ( Mic 2) The waveform from Mic 1 between -164µs and 500 s is clearly visible in the trace from Mic 2 delayed by 2929 µs. There is second variation , in the waveform from Mic 1, around 1.5 ms caused by an echo from one wall or ceiling.
  • 10. ENHANCE Telling how far away a person with a starter’s gun, at a running race, is by comparing the time difference from when you can see the gun’s smoke to when you hear the sound. Telling how far away a cliff is by making a sound and measuring how long it takes for the echo to return Telling where an enemies gun was fired. Telling how far away a lighting strike.
  • 11. THE END