Double-Slit Interference: a Pair of Narrow Slits, Separated by 1

question 42

Multiple Choice

Double-slit interference: A pair of narrow slits, separated by 1.8 mm, is illuminated by a monochromatic light source. Light waves arrive at the two slits in phase, and a fringe pattern is observed on a screen 4.8 m from the slits. If there are 5.0 complete bright fringes per centimeter on the screen near the center of the pattern, what is the wavelength of the monochromatic light?

• A) 550 nm
• B) 600 nm
• C) 650 nm
• D) 700 nm
• E) 750 nm

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