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AP Physics 2
14.8 Double-Slit Interference and Diffraction Gratings
14.4 Electromagnetic Waves
IntermediateMCQConceptual25.6k
A horizontal diagram showing a vertical barrier on the left containing two narrow slits separated by vertical distance d. A vertical viewing screen is situated on the right at a horizontal distance L from the barrier. A horizontal dashed centerline extends perpendicular from the midpoint between the slits to the center of the screen. Two dashed straight lines extend from the two slits to a single common point on the screen located at a vertical displacement y above the centerline. No other labels, lines, text, or axes appear.
Double-slit interference setup.
In a Young's double-slit experiment, monochromatic red light and monochromatic violet light are successively directed through the same slit apparatus onto a distant screen. Students observe that the bright interference fringes produced by the red light are spaced farther apart than the bright fringes produced by the violet light. Which of the following statements provides the best physical explanation for this observation?

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