A natural sample of copper shows two peaks of equal height at and

CHEMISTRY · Subjective · A Level · Chemistry · Atomic structure · Atomic structure

Problem

A natural sample of copper shows two peaks of equal height at

m/z = 63

and

m/z = 65

. A second sample shows peak heights of 90 units at

m/z = 63

and 10 units at

m/z = 65

. By what factor has the relative abundance of the lighter isotope (

m/z = 63

) increased in the second sample compared with the natural sample?