()U91/2UPbU9238/ 2064.47 10 y2380.15mglnln 1ln2ln 22060.86mg1.18 10 y.Tmmtm⎡⎤⎛⎞+×==+⎜⎟⎢⎥⎝⎠⎣⎦=×For the βdecay of 40K, the initial mass of 40K is mmmKKArKAr040 40=+=+/,bgso eett0KKArK+−−λλbg.We solve for mK: K99ArArKln2 1.1810 y/1.2510 y1.6mg1.7mg.111tmemmeeeλ−−××==−63. We can find the age tof the rock from the masses of 238
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This note was uploaded on 05/19/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.