A vehicle carries a microwave transmitter that emits microwaves of a constant frequency. A stationary observer has a microwave receiver.
The vehicle moves directly towards the observer at constant speed. The observer detects microwaves of frequency ${F_o}$.
The vehicle then accelerates, still moving towards the observer, travels at higher steady speed for a time and then decelerates until it stops.
What is the variation in the frequency of the microwaves that are detected by the observer?
1 )
The observed frequency will fall, then remain steady then return to the frequency ${F_o}$.
2 )
The observed frequency will fall, then remain steady then rise to a higher frequency than ${F_o}$.
The observed frequency will rise, then remain steady then fall to a lower frequency than ${F_o}$.
4 )
The observed frequency will rise, then remain steady then return to the frequency ${F_o}$.
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