select the correct answer.
a grass snake living in northern england dies of natural causes. after a long period of time, its remains decay in the soil to become fossil fuel. when the fossil fuel is processed, sold, and burned by humans, it releases carbon dioxide into the air. which aspect of this scenario shows a carbon source becoming a carbon sink?
a.
burning of the fossil fuel
b.
decaying of the snake’s remains
c.
dead snake fossilizing underground
d.
respiration by the snake and humans
e.
humans processing and selling the fuel

Antireflective coatings on solar cells are often made by applying a thin film of silicon nitride (sinx), which has an index of refractive of 1.2, on the top of the silicon solar cell, which has a refractive index of about 3.5. however, the sun emits radiation of various wavelengths which the solar cell absorbs, and the antireflective coating can only absolutely minimize the reflection of one of these wavelengths. the coating thickness is chosen to reduce the reflection of green/yellow light (e = 2.2 ev), which is the most intense color in the solar spectrum (shown below). which of the following coatings would minimize reflection of green/yellow light? the answer is 820 nm how? what is the angular width of the central maximum of an electron traveling at 2 x 108 m/s going through a single slit of width 1 mm.