In a semiconductor it is observed that three-quarters of the current is carried by electrons and one quarters by holes. If the drift speed is three times that of the holes, what is the ratio of electrons to holes?

Semiconductors topics include: Free electron theory, semiconductors properties and classification, hall effect, solar cell, p-n junction characteristics, zener diode, rectifier, led and transistors. Semiconductors are materials with electrical properties that fall between conductors and insulators. They can be pure elements, like silicon or germanium, or compounds, like gallium arsenide or cadmium selenide.  Semiconductors are the foundation for electronics, especially computers. They are smaller in size, take up less space, and use less power than vacuum tubes. Because they can be made so... Show more

Semiconductors topics include: Free electron theory, semiconductors properties and classification, hall effect, solar cell, p-n junction characteristics, zener diode, rectifier, led and transistors.

Semiconductors are materials with electrical properties that fall between conductors and insulators. They can be pure elements, like silicon or germanium, or compounds, like gallium arsenide or cadmium selenide. 

Semiconductors are the foundation for electronics, especially computers. They are smaller in size, take up less space, and use less power than vacuum tubes. Because they can be made so small, electrical devices can be made thin and lightweight without compromising processing power. 
A crucial property of semiconductors is the band gap, which is a range of forbidden energies within the material's electronic structure. 
In 1874, Karl Braun discovered and documented the first semiconductor diode effect. In 1901, the first semiconductor device, called "cat whiskers," was patented.

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