### Are the elemental semiconductors silicon and germanium

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1.A municipal landfill has available space of 16.2 ha at an average depth of 10 m.seven hundred sixty-five (765)m^3 of solid waste is dumped at the site 5 days a week. This waste is compacted to twice its original density

2.Are the elemental semiconductors silicon and germanium transparent to visible light? Why or why not?

3.Which of the following oxide materials when added to fused silica (SiO2) will increase its index of refraction: Al2O3, TiO2, NiO, MgO? Why?

4.Electromagnetic radiation may be treated from the classical or the quantum-mechanical perspectives. Briefly compare these two viewpoints.

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