Question: What is the probability that an electron in the ground state of the hydrogen atom will be found between two spherical shells whose radii are

What is the probability that an electron in the ground state of the hydrogen atom will be found between two spherical shells whose radii are r and r + ∆r,
(a) if r = 0.500a and ∆r = 0.010a and
(b) If r = 1.00a and ∆r = 0.07a, where a rs the Bohr radius?

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