The uv light that is responsible for tanning the skin falls in the 320-nm to 400-nm region. calculate the total energy (in joules) absorbed by a person exposed to this radiation for 2.5 h, given that there are 2.0 × 1016 photons hitting earth’s surface per square centimeter per second over a 80-nm (320-nm to 400-nm) range and that the exposed body area is 0.45 m2. assume that only half of the radiation is absorbed and the other half is reflected by the body. (hint: use an average wavelength of 360 nm in calculating the energy of a photon.)