# + Did You Hear That? By Andrew Cobb & Ionut Albu.

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+ Did You Hear That? By Andrew Cobb & Ionut Albu

+ The “Screaming” Balloon What made the balloon “scream”? Key Question: What is sound, how is it made and transferred?

+ Tuning Fork & Ping Pong Ball DO NOT HIT THE TUNING FORK ON YOUR DESKS. ONLY USE THE PALM OF YOUR HAND. One group member hit the tuning fork, another touch the ping pong ball to the tuning fork Be sure to make a prediction before you start the experiment Let each member of the group give it a try

+ Tuning Fork & Water Hit the tuning fork (again only using your palm) and place it in the water Be sure to only put the tuning fork in about half an inch Don’t touch the tuning fork to the side of the glass, this will mess up your results

+ The “Clucking Chicken” Be careful with how you pull on the string Try it first without wetting the sponge, holding the cup Then try it with a wet sponge, holding the cup Then, while also using a wet sponge try it holding the string and not the cup

+ Sound Wave Wavelength Amplitude

+ Wavelength and Frequency Short Wavelength Long Wavelength

+ Pitch Pitch makes a sound “high” or “low” Depends on frequency Objects with less matter vibrate faster Faster vibration = Higher frequency Higher Frequency = Higher pitch Objects can vibrate or the air inside of them, this affects the kind of pitch you get.

+ Predict Pitches for each Bottle: Struck ✓ ✓ ✓

+ Predict Pitches for each Bottle: Blown ✓ ✓ ✓

+ Review Sounds are made by vibrations. travel as waves. Waves have energy. are measured from peak to peak or trough to trough. Frequency measures the number of vibrations in one second. Pitch How “high” or “low” a sound is and depends on frequency

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