A stiuden goes for a bike ride ayt 20 meters

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

How is coal extracted from mountaintop removal mines? a. dynamite is used to create underground tunnels where miners go to extract the coal. b. dynamite is used to break apart rocks and then draglines are used to remove the broken rock and reach the coal. c. coal in mountaintops is extracted by digging strips in the landscape to reach the coal. d. placer deposits in mountain river bottoms are removed by

Hydrogen and helium are both members of?