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adiptadatta
adiptadatta asked in Science & MathematicsPhysics · 1 decade ago

Please answer this question:?

How many orders will be visible if the wavelength of the incident radiation is 5893angstrom and the number of lines on the grating is 2540/inch?

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  • Bandagadde S
    Lv 6
    1 decade ago
    Favorite Answer

    Use (a+b)sinθn = nλ

    The maximum possible value of sinθn = 1

    (a+b) = n λ

    (a+b) = 1/2540 in = 2.54/2540 cm

    λ = 5893x10^-8 cm

    n = (a+b)/λ = 2.54/(2540x5.893x10^-5 ) = 16.97 = 17

    17 orders will be visible

  • Retsum
    Lv 6
    1 decade ago

    No one uses angstroms and inches these days. Use SI units.

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