Can someone please shows me the steps and answer. Urgent!

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

Around faucet handle is part of a(n) a. lever b. screw c. inclined plane d. wheel and axle

Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. initially, air is at 400 kpa and 17°c. the paddle wheel is now turned by an external electric motor until 75 kj/kg of work has been transferred to air. during this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. calculate the required amount of heat transfer in kj/kg.