Answer
See explanation.
Work Step by Step
a. Calculate the energy of a single photon.
$E=\frac{hc}{\lambda}=\frac{(6.626\times10^{-34}J\cdot s)(3.00\times 10^8 m/s)}{0.0200\times10^{-9}m}=9.94\times10^{-15}J$
Multiply by the total number of photons to find a total energy of 0.497mJ.
b. The absorbed dose is $\frac{4.97\times10^{-4}J }{0.600kg}=8.29\times10^{-4}J/kg$. This converts to 0.0828 rad. For x-rays, RBE = 1, so the equivalent dose in rem is 0.0828 rem.
