1. The Doppler Effect Introductory Video as a sound source moves towards you it appears to have a higher frequency than normal as the source moves away it appears to have a lower frequency Video: Train and the Doppler Effect Video: The Doppler Effect – What does motion do to waves? Doppler Effect: applet

2. As the car approaches the wavelengths are shorter thus the frequency is great, as the car goes by the wavelengths are longer thus the frequency is lower.

3. f 2 - apparent frequency f 1 - real (actual) frequency v sound - speed of sound in medium v source – speed of source (i.e. train) v sound - v source – object approaches v sound + v source – object leaves

4. A car is traveling at 120.0 km/h on a 30˚C day. The frequency of the car is 350 Hz. Calculate the apparent frequency.