A source of sound with natural frequency \( v_{0}=1.8 \mathrm{kHz} \) moves uniformly along a st...

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A source of sound with natural frequency \( v_{0}=1.8 \mathrm{kHz} \) moves uniformly along a straight line separated from a stationary observer by a distance \( I=250 \mathrm{~m} \). The velocity of the source is equal to \( \eta=0.80 \) fraction of the velocity of sound. Find :
the distance between the source and the observer at the moment when the observer receives a frequency \( v=v_{0} \).
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