Myeloma: Rare Types. Rare types of medical conditions and diseases in related medical categories: 1  Women's Reproductive Health -- rare types of diseases: 2  Overactive Bladder Syndrome -- Rare Types. 3  PCOS -- Rare Types. 4  Chlamydia -- Rare Types. 5  Pelvic Inflammatory Disease -- Rare Types. 6  Cervical Cancer -- Rare Types. 7  Breast Cancer -- Rare Types.
Definition of wafer - a thin, light, crisp biscuit, especially one of a kind eaten with ice cream., a thin piece of something Definition of wafer - a thin, light, crisp biscuit, especially one of a kind eaten with ice cream., a thin piece of something
Think of the wafer as a cake that is mixed and baked in a prescribed manner, and impurities as nuts suspended in the cake. The particular semiconductors used for LED manufacture are gallium arsenide (GaAs), gallium phosphide (GaP), or gallium arsenide phosphide (GaAsP). The different semiconductor materials (called substrates) and different impurities result in different colors of light from the LED.