the following. 7. What is it called when a galaxy is moving toward a telescope at a very high speed? 8. What are two everyday applications of the Doppler effect? 9. What variables must be known to determine the observed frequency of a wave? 10. If the observer moves toward the source, will the observed frequency be greater than or less than the emitted frequency? Will the numerator of the Doppler effect equation need to increase or decrease for this to happen? 11. If the source is moving toward the observer, will the observed frequency be greater than or less than the emitted frequency? Will the denominator of the Doppler effect equation need to increase or decrease for this to happen? 12. What is created when an object travels faster than the speed of sound? " PHYSICS INMOTION gpb.org/physics-motion Unit 6C The Doppler Effect Questions to Consider Date: Answer the following, 1. When an emergency vehicle siren approaches you, how does its observed pitch compare to what you hear after the vehicle passes you? 2. Define the Doppler effect in your own words. When an emergency vehicle siren approaches you, how does the wavelength of the sound that reaches you compare to the actual wavelength of the sound that the siren emits? 4. What kinds of waves experience the Doppler effect? 5. Why are you able to observe the Doppler effect on earth with sound waves but not with light waves? 6. When stars move away from a telescope, what color do they appear to be compared to the actual light they emit