Welcome back to Apologia Physical Science lab! In this lab it's all about sound waves!
Apologia Physical Science Module 14 Labs
14.1 The Medium through which sound waves travel.
Waves must travel through some kind of medium. These two experiments demonstrate different mediums for sound waves.
Cut the bottom of a 2 liter bottle off and cover the opening with saran wrap and tape. Holding the bottle "drum" over a lit candle, hit the drum and observe the flame.
In the second part of this lab, stretch saran wrap over a bowl and spread rice on top of the wrap. Placing a pot or skillet close to the bowl, strike the bottom with a spoon and observe what happens to the rice. Dance rice, dance!
Experiment 14.3 Wavelength and Sound.
Wavelength of sound waves has a dramatic effect on how we hear the sound.
Get a glass bottle with a narrow neck. Fill it with different amount of water. Blow gently across the top and listening to the difference in pitch.
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Experiment 14.4 Doppler Effect
Pitch of sound depends on the frequency of the sound waves produced. The pitch of a sound is affected by the motion of the object making the sound.
Standing still, have a parent drive down the street in your direction at least 20 mph. A few second before they come to passing you, have them sound the horn until after they pass you.
Note the difference sin how the horn sounds before and after the car passes you.
Experiment 14.5 Amplitude of a Sound Wave.
The amplitude of a wave tells you how big the wave is. For sound waves, amplitude has a very easy to detect effect on the nature of the sound produced.
Make a simple "instrument" by stretching a rubber band across a plastic tub. Holding it so you can easily see the rubber band, pluck the bank lightly and observe. Pluck it hard and observe.
Join us next time for Module 15 and Light.
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