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L
GROUP MEMBERS
 NOR FAZREENA BINTI MA’AMOR
   (D20101037526)
 NURSYAKHILA BINTI ZAHARI
    (D20101037523)
 AYU NADIA BINTI MOHD ZAHID
    (D20101037528)
SPEED OF SOUND

 This experiment describes the use
 of the ADC -212 virtual oscilloscope
 to measure the speed of sound.
SPEED
    OF
SOUND..
Scientific concept :
 The speed of sound is the distance
travelled during a unit of time by a sound
wave propagating through
an elastic medium.
 In common everyday speech, speed of
sound refers to the speed of sound waves
in air.
 However, the speed of sound varies
from substance to substance. Sound
travels faster in liquids and non-
porous solids than it does in air.
Last weekend, my family decide to go to Gua
Kelam in Perlis. As we walk through the cave there
is a lot of nice things to watch. Then, I notice
something interesting, when we talk in the cave, we
can hear our voice be reflect. We hear our own
voice echo. Why this happened? I also notice the
same phenomena occur when I talk in empty house
or when I shout in the tunnel. How can this happen
and what is the cause?
EMPOWER
Equipment 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
Experiment set up
The experiment was set up as shown below with two
 crystal microphones placed 1 metre apart
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.
Data logging
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.
THE END

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Data logging

  • 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 OF SOUND..
  • 5. Scientific concept :  The speed of sound is the distance travelled during a unit of time by a sound wave propagating through an elastic medium.  In common everyday speech, speed of sound refers to the speed of sound waves in air.  However, the speed of sound varies from substance to substance. Sound travels faster in liquids and non- porous solids than it does in air.
  • 6. Last weekend, my family decide to go to Gua Kelam in Perlis. As we walk through the cave there is a lot of nice things to watch. Then, I notice something interesting, when we talk in the cave, we can hear our voice be reflect. We hear our own voice echo. Why this happened? I also notice the same phenomena occur when I talk in empty house or when I shout in the tunnel. How can this happen and what is the cause?
  • 7. EMPOWER Equipment 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.
  • 11. 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.