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

What is relative velocity? in which condition is relative velocity known by adding the velocity of the first body and that of the second body

Chameleons catch insects with their tongues, which they can rapidly extend to great lengths. in a typical strike, the chameleon's tongue accelerates at a remarkable 220 m/s2 for 20 ms, then travels at constant speed for another 30 ms.