1. Properties of Sound Objectives: Describe what effects the speed of sound Explain how frequency and pitch are related Describe and give examples of the Doppler effect Explain how amplitude and loudness are related

2. Challenge? Describe how the Doppler effect helps a dolphins determine whether a fish is moving away from it or toward it?

3. Challenge? Describe how the Doppler effect helps a dolphins determine whether a fish is moving away from it or toward it? a.Echoes from fish moving toward the dolphin will have a higher pitch b.Echoes from fish moving toward the dolphin will have a lower pitch c. Fish moving toward the dolphin will have not have an echo

4. Connection Why is the buzz of a bumble bee lower than the hum of a mosquito? Why is the buzz of the bumble be louder than the hum of the mosquito?

5. Connection Why is the buzz of a bumble bee lower than the hum of a mosquito? Why is the buzz of the bumble bee louder than the hum of the mosquito? a.The wings of a bee beat faster than the wings of a mosquito b.The wings of a mosquito beet faster than the wings of a bee a.The wings of a bee flap farther than the wings of a mosquito b.The wings of a mosquito flap farther than the wings of a bee

6. Vocabulary pitch Infrasonic Ultrasonic Doppler effect Loudness Decibel

7. Activities/Assignments Ruler activity – Pitch & Amplitude Pitch Problem 1 & 2 (not available online) Doppler effect (in-class activity) Measuring Speed of Sound (in-class activity) Clucking Chicken or Peeping Peeps