Q:2-A police car is at a red light. A car behind him foolishly tests his luck and runs the red light. The officer immediately flicks on his siren and begins to chase the car, accelerating at a rate of 1.5m/s² . The frequency of the siren is 500Hz. If you are standing at the red light, what frequency do you percieve 6 seconds after the police officer began chasing the car?
v_s=340m/s
Mark one answer:
514Hz
472Hz
487Hz
528Hz
500Hz

Q:3-A group of storm chasers has found a tornado that is traveling north at a rate of 20m/s. The storm chasers are south of the storm, trying to catch up. If they are traveling at a rate of 30m/s and percieve an average frequency of 4,000Hz coming from the storm, what is the actualy frequency of sound that the storm is emitting?
v_s=340m/s
Mark one answer:
2650Hz
3890Hz
4130Hz
3460Hz
4650Hz

Q:4-You and your friends are spending an afternoon at a lake. You are racing a friend across the lake while staying under the water. Being the faster swimmer, you are averaging a pace of about 1.5m/s. Another friend on shore is cheering you on. If the average frequency of your friend's voice is 500Hz, and the wavelength of the sound in the water is 0.85m, what is the speed of the sound in the water?
v_sair=340m/s
Mark one answer:
400m/s
340m/s
556m/s
425m/s
425m/s

Q:5-One of your friends decides to do a massive cannonball into a swimming pool in an attempt to splash the lifeguard. Your friend hits the water 5m from where the lifeguard is and the cannonball creates a series of waves. If one wave is created every 2 seconds, and there are four full waves between your friend and the lifeguard, what is the speed of the waves created?
Mark one answer:
1.67m/s
0.40m/s
0.12m/s
2.5m/s
0.63m/s