1. Sound
Week 2
Can begin by asking what do students think sound is?

2. Sound Sound: Energy that travels as a vibration
Everything we hear is a vibration picked up by our ears

3. Elaborate on the purpose of a loudspeaker (displace air and push sound)

4. Echoes Echo: Sound Waves that reflect
Sound waves can bounce off of surfaces
Ask for places where echoes are common/uncommon; elaborate on why

5. Vacuum A space without matter That’s why there’s no sound in space
Sound is impossible
That’s why there’s no sound in space
Talk about how films get it wrong

6. Wavelengths These things define sounds
Frequency: The number of waves in a given time
Amplitude: height of a wave
Wavelength: distance between crests
Talk about how amplitude defines volume; Frequency and wavelength define pitch
Elaborate how all sounds, no matter how different, can be graphed like this

7. Wavelengths
Reiterate the effects of each on pitch and volume