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7 March, 12:03

A diffraction grating with 1000 lines per mm is used in a spectrometer to measure the wavelengths of light emitted from a gas discharge tube. You measure the diffraction angle to be at 20° for one emission line. What would happen to this emission line's diffraction angle if you replaced the diffraction grating with one having 500 lines per mm instead

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  1. 7 March, 12:59
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    = 9.8°

    Explanation:

    Width of one slit (a₁) = 1 / 1000 mm=0.001 mm = 10⁻⁶ m.

    width of one slit in case 2 (a₂) = 1/500 = 2 x 10⁻⁶ m

    angular position of fringe, Sinθ = n λ / a

    n is order of fringe, λ is wave length of light and a is slit aperture

    So Sinθ ∝ 1 / a

    Sin θ₁ / Sin θ₂ = a₂/a₁;

    Sin20°/sinθ₂ = 2 / 1

    sinθ₂ = Sin 20° / 2 =.342/2 =.171

    θ₂ = 9.8 °
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