Multiple Choice
The intensity of gamma rays passing through a material as a function of thickness, x is given by where n is the number of atoms per cm3 and is the absorption cross section. If the intensity of gamma rays of a particular energy is reduced by half when they passed through 1 cm of lead, what is the absorption cross section for the gamma rays? The density of lead is 11.3 g/cm3 and its molar mass is 207 g.
A) 3.5 * 10-
22 cm2
B) 6.8 * 10
22 cm2
C) 4.6 * 10
23 cm2
D) 2.1 * 10
23 cm2
E) 8.4 * 10
24 cm2
Correct Answer:
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