Each of the photographs at right shows a part of a ripple tank that contains two sources that are in phase.
For each of the photographs, identify:
• nodal lines
• the approximate locations of the sources
• the line that contains the two sources
Which of the two photographs more closely corresponds to the situation that you have been studying? Explain your reasoning.
What difference(s) in the two situations could account for the difference in the number and the locations of the nodal lines?
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