3:03 ME C . Cut all 51%% > The Doppler Effect gpb.org/physics-motion Practice Problems Date: Work each of the following problems. SHOW ALL WORK. 1. It is known that a siren emits a frequency of 2,000 Hz. If an observer hears a frequency of 1,800 Hz, is the siren moving toward or away from the observer? 2. A car horn emits a frequency of 400 Hz in 20 C air, which has a speed of sound of 343 m/s. If the car is moving toward a stationary observer at 20 m/s, what is the frequency that is observed? (vV obs fobs = source (V + V source) Jobs = ? Source = source V = 3. The frequency of a tornado siren is 1,000 Hz. If a cyclist is moving toward the siren at 10 m/s in 15 .C air, which has a speed of sound of 340 m/s, what is the frequency that the cyclist observes? vivobs fobs =S source (V I V source) fobs = ? Source = V = questions continued on next page Unit 6C_Practice Problems Copyright @ 2018 Georgia Public Broadcasting. All rights reserved. Use or distribution by an unintended recipient is prohibited. 1/2 PHYSICS Unit 6C Name: INMOTION> > > The Doppler Effect gpb.org/physics-motion Practice Problems Date: Work each of the following problems. SHOW ALL WORK. 4. A tug boat horn emits a frequency of 250 Hz in 18 C air, which has a speed of sound of 342 m/s. If the tug boat is moving away from a stationary observer at 15 m/s, what is the frequency that is observed? (vvobs fobs =f source (V + V source fobs = ? V obs Ssource = source V = 1II O