Multiple choice. 1. What sort of waves exhibit the Doppler effect? a) light waves. b
) water waves. c) sound waves. d) all of the above. e) none of the above. 2.
Multiple choice. 1. What sort of waves exhibit the Doppler effect? a) light waves. b) water waves. c) sound waves. d) all of the above. e) none of the above. 2. The Doppler effect is produced if a) the source is in motion. b) the detector is in motion. c) both of the above. d) none of the above. 3. Two vehicles at driving, in the same direction, down a highway at 100 km/h. A passenger in the leading car sounds a 1000 Hz whistle. What frequency will a passenger in the following car hear? a) < 1000 Hz. b) > 1000 Hz. c) 1000 Hz. d) 100 Hz. e) none of these. 4. The cars described in the question above pass a stationary pedestrian, standing by the side of the road. If the speed of sound in still air is 1200 km/h, what frequency does the pedestrian hear as the cars approach? What frequency does the pedestrian hear as the cars recede? a) 1000 Hz and 1000 Hz. b) 1091 Hz and 923 Hz. c) 923 Hz and 1091 Hz. d) 1091 Hz and 1091 Hz. e) 923 Hz and 923 Hz.
5. The following figure shows pressure vs. time for a sound wave when the source is stationary with respect to the observer.
Which of the following best represents the sound wave if the source is moving towards the observer?
a.
c.
e.
b.
d.
6. The following figure shows pressure vs. time for a sound wave when the source is stationary with respect to the observer.
Which of the following best represents the sound wave if the source is moving away from the observer?
