29. the origin of waves together, Ah, 2 thousand faset project, paste the same distance 6 cm to 40 cm/sec wave speed while it waves with a frequency of 20 Hz, thou shalt find that practice will be from the middle of the three, Ben? A. 30° (B) 45° C. 60° D. 90°Answer c25. If the source of the waves together, Ah thousand faset project 21 centimeters away, 10 Hz frequency distribution having the speed to 40 cm/sec. The interference will cause vertical buffer and buffer between the seams of the two sources? A. concept 9 and 10. B. 10 and 9 horizontal C. vertical 10 and 11. D. 11 and 10 horizontal
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