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The vacant space of solid's electronic e...

The vacant space of solid's electronic energy level is called

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(b) Two forms of mechanical energy : Potential energy `E_(p)` and Kinetic energy `E_(k)`.
(c ) (i) The sun.s heat evaporates moistures so that it falls back to the earth as rain. Hydroelectric power plants harness the energy of moving water.
(ii) The sun powers the air currents that cause the wind to blow.
This wind energy is used in windmills to generate electricity.
(iii) Fossil fuels are the transformation of solar energy.
(iv) Solar energy can be converted into electric power through photovoltaic conversion.
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