The difference in entropy AS = Sg-SA for two states A and B of a system can be computed as the integral of dQ/T provided:
A. the energy absorbed as heat by the system is first computed.
B. the change in internal energy is first computed.
C. A and B are on the same adiabat.
D. a reversible path is used for the integral.
E. A and B have the same temperature.

When a vertical beam of light passes through a transparent medium, the rate at which its intensity i decreases is proportional to i(t), where t represents the thickness of the medium (in feet). in clear seawater, the intensity 3 feet below the surface is 25% of the initial intensity i0 of the incident beam. what is the intensity of the beam "10" feet below the surface? (give your answer in terms of i0. round any constants or coefficients to five decimal places.)