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Describe how the fermi level changes with donor level, temperature and contact with p and n type semiconductors

Ahot-air balloonist, rising vertically with a constant speed of 5.00 m/s releases a sandbag at the instant the balloon is 40.0 m above the ground. after it is released, the sandbag encounters no appreciable air drag. compute the velocity of the sandbag at 0.250 s after its release.

The solid that is formed and usually sinks to the bottom of a solution is the