Author Question: Carbon-14 has a half-life of 5730 years. A sample of wood has been recovered by an archaeologist. ... (Read 161 times)

berenicecastro · **on:** Jul 29, 2018

Carbon-14 has a half-life of 5730 years. A sample of wood has been recovered by an archaeologist. The sample is sent to a laboratory, where it is determined that the activity of the sample is 0.144 Bq/g.

By comparing this activity with the activity of living organic matter, 0.230 Bq/g, the scientist determines how old the wood sample is, or more precisely, when the tree that the sample came from died. How old is the sample of wood? A)

3870 years
B)

4250 years
C)

4590 years
D)

2630 years
E)

2940 years

Question 2

The thermal neutron cross section of a proton is 0.33 bn. If this cross-section were to represent the circular cross-sectional area of the proton presented to the neutron beam, what would be the radius of the proton?

A)

1.2 x 10-15 m
B)

1.6 x 10-15 m
C)

3.2 x 10-15 m
D)

4.1 x 10-15 m
E)

5.2 x 10-15 m