1. What thickness of concrete and of lead are needed to reduce
the intensity of narrow 500 keV photon beam to one-fourth its
value? Compare the thickness in cm and in g/cm2. Repeat for 1.5 MeV
photons.
2. A 3 MeV point source of grams is located at the center of a
6.0 cm diameter iron sphere. The lead sphere is surrounded by a
spherical shell of lead 3 cm thick (The resulting sphere is a
radius 6.0 cm).
a)...
Several wires of varying thickness are all made of the same material and all have the same length. If the wires are arranged in order of decreasing thickness, what can be said about the ordering of their resistance?
A. The wires will be arranged in order of increasing resistance.
B. The wires will be arranged in order of decreasing resistance.
C. The ordering of the resistances can not be determined because the resistivity is not given.
D. The ordering of...