1. Warm Up 8 Cell membranes perform all the following functions except — A making nutrients for cells B holding cytoplasm within cells C regulating substances exiting cells D recognizing other cells

2. No Tuesday Morning Tutorial No Wednesday Tutorials at all Thursday will have both morning and afternoon tutorial.

3. Sound Waves

4. Sound Basics Low frequency = low tone (bass) High frequency = high tone (treble) Sound Intensity is measured in Decibels (dB). Decibel is a logarithmic scale 10 dB = 10 times louder than 0 dB 20 dB = 100 times louder than 0 dB

5. Standing Wave (harmonics) Standing Wave (harmonics) Created by wave interference Created by wave interference Notes from a musical instrument (strings, horns, reeds, piano, pipe organ, etc) are standing waves Notes from a musical instrument (strings, horns, reeds, piano, pipe organ, etc) are standing waves Transverse and longitudinal waves produce standing waves Transverse and longitudinal waves produce standing waves

8. Doppler Effect Produced when either the source or the observer is moving

9. Doppler Effect Math Speed of Sound is considered constant Wavelength is ____________ when sound is approaching Frequency has to ___________.

10. Doppler Effect Math Speed of Sound is considered constant Wavelength is ____________ when sound is receding (moving away). Frequency has to ___________.

11. Doppler Effect in the Real World Doppler Radar Radar guns Red/Blue Shift in astronomy

12. Bow Waves Shock Waves Bow waves are produced by objects moving faster than the wave. Shock waves are 3D bow waves.

13. Sonic BOOOOM!

14. Exit Ticket 5 Draw a standing wave with 4 nodes.