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Post on 04-Apr-2015
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2.20) An electron in free space is described by a plane wave given by where k = 1.5 x 109 m-1 and .
a) Determine the phase velocity of the plane wave. b) Calculate the wavelength, momentum, and kinetic energy (in eV) of the electron. Jawab: a) Mencari nilai Maka,
Keterangan: diturunkan menjadi 0
b) Mencari nilai 1. Mencari nilai Diketahui: Maka,
2. Mencari nilai
3. Mencari nilai Diketahui:
Maka,
6.4) (a) A sample of semiconductor has a cross-sectional area of 1 cm2 and a thickness of 0.1 cm. Determine the number of electron-hole pairs that are generated per unit volume per unit time by the uniform absorption of I watt of light at a wavelength of 6300 A. Assume each photon creates one electron-hole pair. (b) If the excess minority carrier lifetime is I0 hrs, what is the steady-state excess carrier concentration? Jawab:a)
diketahui
maka :
kemudian :
b) mencari konsentrasi steady state excess carrier
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