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caonhan137
2 năm trước
Trong thí nghiệm giao thoa sóng nước, người ta dùng 2 nguồn dao động cùng pha,với biên độ không đổi 4cm, bước sóng 20cm. Tại một điểm cách 2 nguồn những khoảng lần lượt là 25cm và 30cm sẽ dao động với biên độ: A. 8cm. B. 4 căn 2. C. 0. D 4 căn 3
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