SAT Subject Physics Practice Question 663: Answer and Explanation

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Question: 663

14. Water waves strike a solid barrier in which there is a single small opening. Waves that pass through the opening

A. converge.
B. fan out.
C. invert.
D. interfere.
E. polarize.

Correct Answer: B


The correct answer is (B). This is an example of Hyugen's principle, which states that a point on a wave front can act as a source of waves. The waves fan out from the point at the barrier as new waves are formed.

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