Why does the sun appear to move westward across the sky during the day?
a) because earth rotates to the east
b) because earth rotates to the west
c) because the sun moves in a westerly direction
d) because of the way you are looking into the sky

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.)