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  1. A function n(x) satisfied the differential equation where L is a constant. The boundary
    conditions are: n(0) = K and n(∞) = 0. The solution to this equation is

    2. A.
    n(x) = K exp(x/L)
    B.
    n(x) = K exp (-x/L)
    C.
    n(x) = K2 exp (-x/L)
    D.
    n(x) = K exp (-x/L)

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    Answer : Option D

    Explanation :

    n(∞) = 0, ∴ B = 0, n(0) = k ∴ B = k.

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