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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 ofthe ADC -212 virtual oscilloscope tomeasure the 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 upThe experiment was set up as shown below with two
crystal microphones placed 1 metre apart
Results :
The balloon was burst approximately 2m away from the foremost Mic. The plot below shows the results clearly.
The lefthand “BLUE” trace is from the foremost Mic(Mic1) and the righthand “red” trace is from mic(Mic2)
The waveform from Mic1 between -164µs and 500 s is clearly visible in the trace from Mic2 delayed by 2929 µs. There is second variation , in the waveform from Mic1, around 1.5 ms caused by an echo from one wall or ceiling.
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.