theDopplerEffect has originally been used in astronomy to measure how fast stars are coming towards us or going away from us. Nowadays it is used to measure the velocity of any object. what drivers most afraid from as a velocity measuring device was first invented using this idea. the working principle of that device is such that the rays emitted with a constant frequency are reflected back by the object. because of theDoppleEffect the frequency of reflection is different than the emission. the ratio between upcoming frequency and the emitted frequency gives us the linear velocity of that object.
how fast you are losing or gaining someone, as a friend or lover, depends on the ration between how much you give to them and how much you get from them
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