Ở mặt thoáng của một chất lỏng có hai nguồn sóng kết hợp A và B cách nhau 21 m, dao động theo phương thẳng đứng với chu kì T =0,02 s. Biết tốc độ truyền sóng trên mặt chất lỏng là 40 m/s. Ax là nửa đường thẳng nằm ở mặt chất lỏng và vuông góc với AB. M nằm trên Ax cách nguồn A đoạn 10 m. Số điểm dao động với biên độ cực đại trên MA là: A.10 B.12 C.9 D.11

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