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In a Young's double-slit experiment the center of a bright fringe occurs wherever waves from the slits differ in the distance they travel by a multiple of: A. a fourth of a wavelength B. a half a wavelength C. a wavelength D. three-fourths of a wavelength

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In a Young's double-slit experiment the center of a bright fringe occurs  wherever waves from the slits differ in the distance they travel by a multiple  of:  
A. a fourth of a wavelength  
B. a half a wavelength
C. a wavelength  
D. three-fourths of a wavelength
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C. a wavelength
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