SAT Subject Physics Practice Question 579: Answer and Explanation

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Question: 579

5. When a light ray strikes a perfectly reflective mirror at an angle, which of the following happens?

A. The frequency of the light ray changes.
B. The wavelength of the light ray changes.
C. The velocity of the light ray changes.
D. The period of the light ray changes.
E. The direction of motion of the light ray changes.

Correct Answer: E

Explanation:

The correct answer is (E). The process of reflection occurs when the direction of a wave is changed because the wave strikes a barrier (which in this occasion is a mirror).

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