In the following situations a light is being directed towards you by the object
ID: 1698813 • Letter: I
Question
In the following situations a light is being directed towards you by the object described. In which of the following will you (the observer) see a LOWER frequency (a redshift) than what the source is emitting? Choose all that apply.In the following situations a light is being directed towards you by the object described. In which of the following will you (the observer) see a LOWER frequency (a redshift) than what the source is emitting? Choose all that apply.
1.A police car is stationary. You are moving towards it while traveling 50 mph.
2.A fire truck is moving towards you while traveling 50 mph. You are moving away from it while traveling 40 mph.
3.An ambulance is moving away from you while traveling 40 mph. You are moving away from it while traveling 40 mph.
4.A train is circling you. You are stationary.
5.A flying saucer is moving away from you while traveling 40 ft/min. You are moving away from it while traveling 40 ft/min.
Explanation / Answer
a) When the police car is stationay and observer moving towards the source, frequency of the light observed will be greater than the incident frequency, red shift is not observed.
b) A fire truck is moving towards you while traveling 50 mph. You are moving away from it while traveling 40 mph., this mean that the source is approaching you with greater speed than with what you (observer) is moving. So the frequency is greater than it incident. no red shift is observed.
c) An ambulance is moving away from you while traveling 40 mph. You are moving away from it while traveling 40 mph., this mean that the source and observer are moving away from each other so the frequency is reduced. red shift is observed.
d) There is no change in frequency, no red shift is observed.
e) A flying saucer is moving away from you while traveling 40 ft/min. You are moving away from it while traveling 40 ft/min -this mean that the source and observer are moving away from each other so the frequency is reduced. red shift is observed.
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