SAT Subject Physics Practice Question 345: Answer and Explanation

Next steps

Question: 345

41. At the third maxima on both sides of the zeroth fringe in a Young's double slit experiment, the light

A. travels the same distance.
B. from the lower opening travels three times farther than light from the upper opening.
C. from the upper opening travels three times farther than light from the lower opening.
D. from either opening travels 2 wavelengths farther than light from the other opening.
E. from either opening travels 3 wavelengths farther than light from the other opening.

Correct Answer: E

Explanation:

The correct answer is (E). Each bright spot is a point at which waves constructively interfere. The waves combine at whole number wavelength intervals. This means at 1, 2, 3, etc., wavelengths.The third maxima is where a three-wave difference in the path length occurs.

Previous       Next