The probability density of a particle at a distance r from the nucleus is essentially the:
A)probability of finding the particle within a small volume about r.
B)probability per unit area of finding the particle within a unit area centred on r.
C)probability per unit length of finding the particle within a unit length of r.
D)probability per unit volume of finding the particle within a small volume about r.

Question

The probability density of a particle at a distance r from the nucleus is essentially the:
A)probability of finding the particle within a small volume about r. 
B)probability per unit area of finding the particle within a unit area centred on r. 
C)probability per unit length of finding the particle within a unit length of r. 
D)probability per unit volume of finding the particle within a small volume about r.

Quizplus · Accepted Answer

A probability density is a measure of probability per unit volume, so the best choice is D, which states that it is the probability per unit volume of finding the particle within a small volume about r.

The Probability Density of a Particle at a Distance R