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A source S of frequency f0 and an observ...

A source S of frequency `f_0` and an observer O, moving with speeds `v_1" and "v_2` respectively, are moving away from each other. When they are separeated by distance a(t=0), a pulse emitted by the source. This pulse is received by O at time `t_1" then "t_1`, is equal to

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