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borishaifa [10]
4 years ago
7

explain what happens to a light wave when it encounters a boundary between two media WILL GIVE POINTS

Physics
1 answer:
Valentin [98]4 years ago
4 0
Refraction occurs when a wave crosses a boundary from one medium to another. A wave entering a medium at an angle will change direction.
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an n-type semiconductor is known to have an electron concentration of 5.63 x 1019 m-3. if the electron drift velocity is 113 m/s
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Answer:

1.99581248\ /\Omega m

Explanation:

e = Charge of electron = 1.6\times 10^{-19}\ C

n = Electron concentration = 5.63\times 10^{19}\ /m^{3}

v_d = Drift veloctiy = 113 m/s

E = Electric field = 510 V/m

Electron mobility is given by

\mu=\dfrac{v_d}{E}\\\Rightarrow \mu=\dfrac{113}{510}\\\Rightarrow \mu=0.22156\ m^2/Vs

Conductivity is given by

\sigma=ne\mu\\\Rightarrow \sigma=5.63\times 10^{19}\times 1.6\times 10^{-19}\times 0.22156\\\Rightarrow \sigma=1.99581248\ /\Omega m

The conductivity of this material is 1.99581248\ /\Omega m

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The answer is; E

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