Determine the speed of wave propagation in an elastic medium if the phase difference of the oscillations of two points M and P, spaced from the source at distances y (M) = 20 m, and y (P) = 10 m, is equal to n / 2 radians. The oscillation phase of point M at time t1 = 0.1 s is equal to n radians. The initial phase of source oscillations is zero (source oscillations occur according to the sine law).
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