ch36-p074 - 74. The wavelengths satisfy m = 2d sin = 2(275...

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74. The wavelengths satisfy m λ = 2 d sin θ = 2(275 pm)(sin 45°) = 389 pm. In the range of wavelengths given, the allowed values of m are m = 3, 4. (a) The longest wavelength is 389 pm/3 = 130 pm.
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