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29 April, 08:51

a young's double plit apparatus is set up. a screen is positioned 1.6 m from the double slits and the spacing between the two slits is 0.04 mm. the distance between alternative bright fringes is 1.42 cm. find the light resourse wavelenght

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  1. 29 April, 12:34
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    the answer is : 3.55 * 10∧-7 m

    Explanation:

    using the formula:-

    delta y = (lambda) (L) / d

    GIVEN THAT;

    delta y = 1.42 cm or 1.42 * 10∧-2

    L = 1.6 m

    d = 0.04 mm or 4 * 10∧-5

    NOW rearranging the formula:-

    wavelength = (delta y) (d) / L

    putting the values;

    wavelength = (1.42 * 10∧-2) (4*10∧-5) / 1.6

    THUS;

    wavelength = 3.55*10∧-7 m
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