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Question: 

Monochromatic light falls on two very narrow slits 0.048 mm apart. Successive fringes on a screen 6.50 m away are 8.5 cm apart near the center of the pattern. Determine the wavelength and frequency of the light.

Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014. Reprinted by permission of Pearson Education Inc., New York.
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Quick Answer: 

$6.3 \times 10^{-7} \textrm{ m, } 4.8 \times 10^{14} \textrm{ Hz}$

Giancoli 7th Edition, Chapter 24, Problem 3

(3:15)