Positive direction : bat swing
total momentum before = after
12(bat) + 0(ball) = 8(ball) + bat-after
bat-after is positive then direction is the same
Answer:
Consider an n-type silicon semiconductor at T = 300°K in which Nd = 1016 cm-3 and Na = 0. The intrinsic carrier concentration is assumed to be ni = 1.5 x 1010 cm-3. - Comment Nd >> ni, so that the thermal-equilibrium majority carrier electron concentration is essentially equal to the donor impurity concentration.
Explanation:
Fossil fuels . . . coal, oil, natural gas
Among primitive cultures, wood is an important source.
