questions answer on doppler effect
Answers
Answer:
State doplers effect
applications of doplers effect
THESE ARE SOME QUESTIONS ON DOPPLER EFFECT :
Use the Doppler Effect equation to answer the following questions.
fo= frequency the observer hears fS = frequency from the source
v = velocity of the wave (340 m/s for sound)
vS = velocity of the source vo = velocity of the observer
- when moving toward the listener + when moving towards the source
+ when moving away from listener - when moving away from source
1. A train moving at 25 m/s is traveling towards Mr. Anderson, who is standing in the middle of the tracks. What frequency does Anderson hear if the train has a horn frequency of 1000 Hz?
2. Students leave Humboldt with a speed of 55 mph (25 m/s) blowing their horns at a frequency of 350 Hz. What frequency does Anderson hear standing outside?
3. An airplane traveling 400 m/s towards you is producing a frequency of 250 Hz. What frequency would you hear before and after it passes you?
4. Mr. Anderson is on a rollercoaster traveling at 35 m/s. If you scream at him with a frequency of 700 Hz, what frequency would he hear before and after he passes by you?
5. A car traveling at 20 m/s blows its 440 Hz horn at a truck to try and avoid a head on collision. What frequency does the truck drive hear if he is traveling at 15 m/s?
6. You are in a car traveling at 20 m/s. An ambulance is behind you traveling 35 m/s in the same direction. What frequency do you hear if the siren has a frequency of 550 Hz?