25. An electron is in the 2s level of the hydrogen atom, with the radial wave-function 7/(r) - 22/ (2 7) exp(-2). The probability P(r) of finding this electron between distances r to r + dr from the centre is best represented by the sketch (a) (c) [/(r) 2 lekr) - (b) (d) P(r) 72 P(r)