the diagram shows a chart map which shows the path of second waves. it is invented by a group of University students to help fishermen at the sea.
the sound waves start to travel in a semicircle when meet a reef at point a and end at point d. solve this question in the photo please
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path of second waves. it is invented by a group of University students to help fishermen at the sea.
the sound waves start to travel in a semicircle when meet a reef at point a and end at point d. solve this question in the
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