Q.
P is the probability of finding the 1s electron of hydrogen atom in a spherical shell of infinitesimal thickness dr, at a distance r from the nucleus. The volume of this shell is 4πr2dr. The qualitative sketch of the dependence of P on r is
Probability of finding Is electron is maximum near the nucleus and goes on increasing till it reaches a maximum value at a distance 52.9pm and then begins to decrease abruptly. Even at large distance from the nucleus, there is a finite though small probability of finding an electron of a given energy.