In Fig. 23-1 are shown two identical sound sources sending waves to point P. They send out

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In Fig. 23-1 are shown two identical sound sources sending waves to point P. They send out wave crests simultaneously (they are inphase), and the wavelength of the wave is 60 cm. If L2 = 200 cm, give the values of L1 for which 

(a) Maximum sound is heard at P and 

(b) Minimum sound is heard at P.Fig. 23-1 observer 15 m/s + 20 m/s source

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