SAT Subject Physics Practice Question 663: Answer and Explanation
14. Water waves strike a solid barrier in which there is a single small opening. Waves that pass through the opening
B. fan out.
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.