SAT Subject Physics Practice Question 445: Answer and Explanation

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Question: 445

6. The drawing represents the results in a Young's double slit interference pattern experiment.

Which letter represents the wavelength of the light?

A. A
B. B
C. C
D. D
E. E

Correct Answer: D


The correct answer is (D). The relative retardation of the light wave (the letter D in the diagram) is also its wavelength. The bright spots produced on the screen represent n = 1,2,3, etc., whole number values of wavelengths.

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