STUDY GUIDE 7, SELF TEST 3

© Department of Physics, University of Guelph

1. The count rate 300 cm from a radioactive source is 900 C/min. The detector is moved so that the count rate is 600 C/min. How far is the detector from the source?

2. It is discovered experimentally
that all the γ
s from a particular source are just absorbed by 5.0 mm of copper
(density 9.00 gm/cm^{3}). Would 9.0 cm of
zircon (density 4.70 gm/cm^{3}) absorb all
the γ s from this source?

3. A graph of ln y vs x is plotted below. What is the equation that relates y
to x? Be sure to specify the numerical values and units of all constants in the
equation.

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