1. A police car is driving down the street with its siren on. You are standing still on the sidewalk beside the street. If the frequency of siren Is 1500 Hz and the car is moving towards you at 15 m/s, what is the frequency you would hear from the siren?(v of sound in the air = 343 m/s)
A. 1568.60Hz
B.1321.43Hz
C. 2019.11
D.1676.92Hz
2. If the same police car in question 1 has passed you and is now moving away from you at the same speed, what is the frequency you will hear from the siren?
A.1198.67Hz
B.1390.41Hz
C.1437.15Hz
D1781.55Hz
3.A long distance runner is approaching the finish line. There is a band playing music for all the runners who are finishing. If the runner is running at 1.8m/s and the band is playing music at 991 Hz, what will be the frequency the runner hears as she approaches the band (v sound in air = 343 m/s)
A.1019.13 Hz
B.996.20Hz
C.945.71Hz
D.978.89Hz
4. Two guitars are playing together producing a beat frequency. The first guitar is playing at a frequency of 867Hz and the beat is produced every 0.4 seconds. What are some possible frequencies the other guitar could be playing to make it this beat?
A. 875 Hz or 860 Hz
B. 904 Hz or 830 Hz
C. 878 Hz or 856 Hz
D. 892 Hz or 842 Hz