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A general form of a one-dimensional wave is ψ(x) = sin kx where k is a constant. Show that this function is a solution to the classical expression

((d^2 ψ(x))/ dx^2)= -((2pi)/lambda)^2 ψ(x)

What is the value of k?

I'm not really sure how to approach this problem.

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You simply perform a trial substitution, but we don't answer specific homework questions here. – dmckee♦ Jan 27 at 21:57

closed as too localized by dmckee♦ Jan 27 at 21:57

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