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Properties of Mechanical Waves

Physical Science Ch. 17.2

Joseph Msefya

on 20 December 2010

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Transcript of Properties of Mechanical Waves

Properties of Mechanical Waves Lets Review: What are the
three types of waves? Key Concepts:
Wavelength - how long
Speed - how fast
Frequency - repeatition Wavelength is the distance between a point on one wave and the same point on the next cycle. Wave Speed is calculated by multiplying wavelength and Frequency.

Wave Speed = Wavelength X Frequency Frequency is the number of waves that pass a given point. Let's Practice calculating Speed One end of a rope is vibrated to produce a wave with a wavelength of 0.25 meters. The frequency of the wave is 3.0 Hertz. What is the speed of the wave?

What equation do we need? ______________________
What is the wavelength? ___________
What is the frequency? __________ Do another one on your own...

A wave on a rope has a wavelength of 2.0 meters and a frequency of 7.5 Hertz. What is the wave speed? Quick Lab Activity: Directions Materials:
3.0 meter rope
Tape measure or ruler
Stopwatch Directions:
Tie one end of the rope to the lab faucet head. Shake the loose (free) end of the rope to send waves down the rope.
With your partner, measure the time it takes your hand to move up and down 10 times.
Then measure the distance from your hand to the head of the lab faucet.
Move your hand up and down once and count the time it takes a wave crest to travel this distance.
Repeat the above step again, but this time, shake your hand up and down faster. Analyzing our Data:
Find the frequency of the waves in steps 2 and 3.
Hint: divide 10 waves by the time it took to make them.
Find the wave speed in steps 2 and 3.
Hint: divide distance by time.
Let's Draw Conclusion - how is the wave speed affected by
increasing the frequency? Let's do some practice...
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