Interference by two identical Ultrasonic transmitter

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Ultrasonic waves of the same frequence, amplitude and direction of propagation are generated by two sources positioned parallel to each other. The sources can vibrate both in-phase and out-of phase. The an-gular distribution of the intensity of the waves, which interfere with each other, is automatically recorded using a motor-driven ultrasonic de-tector and a PC ultrasonic frequence amplitude dectector pc science laboratory