Calculate the number of free electrons and holes (in m-3) in an intrinsic semiconductor that has electron and hole mobilities of 0.35 and 0.17 m2/v-s, respectively, and a conductivity of 1.7 (ω-m)-1. use scientific notation.

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A175 g lump of molten lead at its melting point (327 c) is placed into 55.0 g of water at 20.0 c. the specific heat of lead is 130.j/kg c and the hf of lead is 20,400 j/kg. when the lead and the water have reached equilibrium, what is the temperature of the mixture?

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.