(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Calculate the avg. distance from the Hydrogen nucleus for an electron in 2p.

2. Relevant equations

<r> = int[r^3 |R|^2]dr from 0->infinity

For Hydrogen 2p, R = (1/a)^3/2 (1/(2*sqrt(sigma))*sigma*exp(-sigma/2)

where sigma = r/a

3. The attempt at a solution

I get 1/4a^4 (24 a^5) = 6a but the answer's supposed to be 5a. (5a for 2p is supposed to be less than 6a, which is the avg distance for 2s.) What am I doing wrong??????

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# Calculating avg distance from nucleus

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