Doppler Effect Advanced Concepts

Doppler Effect Advanced Concepts

Read each question carefully and provide detailed answers.

1. Describe the Doppler Effect in your own words, explaining how it applies to both sound and light waves. Provide a real-world example for each.

2. Examine the diagram below. Explain how the observer perceives the sound frequency as the source moves towards and away from them.

3. When a source of sound moves towards an observer, the perceived frequency  , and the wavelength  .

4. The formula for the observed frequency of sound when the source is moving and the observer is stationary is f' = f * (v ± v_o) / (v ∓ v_s). In this formula, v represents the   of sound, v_o represents the   of the observer, and v_s represents the   of the source.

5. For electromagnetic waves, a shift to a higher frequency is called a  , and a shift to a lower frequency is called a  .

6. Which of the following phenomena is NOT a direct application or consequence of the Doppler Effect?

7. An ambulance siren emits a frequency of 1000 Hz. If the ambulance is moving towards a stationary observer at 30 m/s, and the speed of sound is 343 m/s, what is the observed frequency?

8. A police car with a 1200 Hz siren is chasing a car. The police car is moving at 40 m/s and the car being chased is moving at 25 m/s. Calculate the frequency heard by the driver of the car being chased. (Speed of sound = 343 m/s)

9. A distant galaxy is observed to have a spectral line that normally has a wavelength of 656.3 nm, but it is observed at 665.0 nm. Is the galaxy moving towards or away from Earth? Calculate its recession or approach velocity. (Speed of light = 3.00 x 10^8 m/s)

10. The Doppler Effect for light depends on the relative speed between the source and the observer, but not on the direction of motion relative to a medium.