1.Set the person on the road a distance away from the sound source. Set the speed of the source to 200 m/s and run the simulation. What do you notice about the difference between the sound waves that hit the observer when the source is moving towards the observer versus when the source is moving away from the observer? (2 points)
2.Set the frequency of the sound wave to 1000 Hz. Set the speed of the source to be 100 m/s. Put the observer a distance away from the source on the road. Set the speed of the sound wave to 340 m/s. Play the simulation. Use the Ruler to measure the distance between the wave fronts in front of the moving source and then measure the distance between the wave fronts behind the source. What are the different distances? (2 points)
3.Using the wave speed equation, calculate the two different frequencies the observer will hear from question 2. Show all work (3 points)
4.How do you predict the answers to question 2 and question 3 would change if you changed the speed of the sound wave to 450 m/s? Explain why you think so. (2 points)
5.Reset the experiment in question 2 and set the velocity of the sound to 450 m/s and repeat the steps in question 2 and 3. Compare your results to your prediction in question 4. Show all work (4 points)
6.Reset the experiment. Place the object closer to the person on the road. Set the frequency of the sound to 500 Hz, the velocity of the source to 200 m/s and the velocity of the sound to 340 m/s. Select the Circular Motion option. Run the experiment. What will be the experience of the observer in terms of the frequency? (Hint: This may be easier to answer if you click the option at the top to display additional waves) (2 points)
7.When the source is rotating in a circle, where does the Doppler Effect seem to happen? (1 point)
8.Set the motion to Oscillation. In what way does the Doppler Effect occur for an oscillating object? (1 point)
9.Electromagnetic waves, or light, are also affected by the Doppler Effect. If the Doppler Effect changes the frequency of the wave experienced by the observer, what would be the physical evidence that light has been Doppler shifted? (1 point)
10.According to astronomers, the light seen by distance stellar bodies relative to Earth are all “red-shifted”. Meaning that the light coming from a large majority of the objects in the universe is ‘redder’ than what it should naturally be. This red shift has been explained by the Doppler Effect. Using what you have learned about the Doppler Effect in this Gizmo, what does the red shifting of almost all stellar objects relative to Earth indicate about universe? (2 points)
2 answers
4 answers