Px = j 2 = (2/l)sin2(4p x/l), for an n = 4 electron

a = peak value of Px = 2/l (i.e., the value of Px at those x for which sin2() = 1)

The wavelength = the length of 2 humps = l/2 for an n = 4 electron.

Probability = area relative to the whole area under the curve which is 1

The area for the space from x = l/2 to x = (3/4)l = 1/4

Wave function or  = Px1/2 is given in the figure.

Answer is C

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