To do: 1)define nd, na, and ni in si and provide common units for each. 2)sketch in an energy band for si the positions of na, nd, ei, ec, and ev. define those terms not defined in 1. 3)if na> nd by a few orders of magnitude where will ef be in the energy band or si? 4)if nd=1e+16cm-3, determine n, p, at 300k.

1) when you rub your hands together quickly, the kinetic energy is converted to mechanical energy.2) thermal energy from the sun travels to earth as infrared waves.3) energy is transferred through the matter of space by electromagnetic waves. 4) when a match is burned, chemical potential energy is converted to thermal and radiant energy. 5) seismicwaves are caused by back and forth movement , or vibration, of an object. 6) mechanicalenergy in an engine changes thermal energy into kinetic energy to make a car move.

Molybdeum(mo)orruthenium (ru)actually, elements with similar chemical properties as technetium would bemn, re, and bh. this is because elements in the same group/family (column) have similar chemical properties. elements in the same period (row) have the same number of energy levels (or shells).