A source emitting electromagnetic signals with proper frequency w0=3.0·10^10 s-1 moves at a constant velocity v = 0.80 c along a straight line separated from a stationary observer P by a distance L (Fig. 5.37). Find the frequency of the signals perceived by the observer at the moment when (a) the source is at the point O; (b) the observer sees it at the point O. Solution: |

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