According to the IPCC (Intergovernmental Panel for Climate Change), 1.6 billion tons of carbon dioxide a year are released into the atmosphere due to deforestation. Until the early 1900s, deforestation was the dominant source of increased CO2 in the atmosphere. What has surpassed deforestation as the number one anthropogenic source of carbon dioxide emissions?

If you put a helium-filled balloon in the refrigerator, what will happen?

Efficiency is the ratio of to for a system a)power in to power in b)power in to power out c) power out to power out d) power out to power in

An electron is trapped at a defect in a crystal. the defect may be modeled as a one-dimensional, rigid-walled box of width 1.00 nm. (a) sketch the wavefunctions and probability densities for the n 1 and n 2 states. (b) for the n 1 state, nd the probability of nding the electron between x1 0.15 nm and x2 0.35 nm, where x 0 is the left side of the box. (c) repeat (b) for the n 2 state. (d) calculate the energies in electron volts of the n 1 and n 2 states