2 years ago

3. Based on what you learned in this lab, describe how the earth’s surface is heated by the sun’s radiation.

Physics

2 answers:

Ymorist [56]2 years ago

5 0

Answer:

I don't know

Explanation:

cause we don't know which lab you are talking about

monitta2 years ago

3 0

Answer:

Hey, I was wondering if you ever got an answer for this question. I'm trying to finish an assignment at the moment that has that same question.

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3 years ago

What is the voltage across a semiconductor bar if the current through it is 0.17 A? The electron concentration in the bar is 2.7

Anastaziya [24]

Answer:

The voltage across a semiconductor bar is 0.068 V.

Explanation:

Given that,

Current = 0.17 A

Electron concentration $n= 2.7\times10^{18}\ cm^{-3}$

Electron mobility $\mu=1000 cm^2/Vs$

Length = 0.1 mm

Area = 500 μm²

We need to calculate the resistivity

Using formula of resistivity

$\sigma=n\times q\times \mu$

$\rho=\dfrac{1}{\sigma}$

Put the value into the formula

$\rho=\dfrac{1}{2.7\times10^{18}\times10^{6}\times1.6\times10^{-19}\times1000\times10^{-4}}$

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We need to calculate the resistance

Using formula of resistance

$R=\dfrac{\rho l}{A}$

$R=\dfrac{2\times10^{-6}\times0.1\times10^{-3}}{500\times(10^{-6})^2}$

$R=0.4\ \Omega$

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$V=0.17\times0.4$

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Hence, The voltage across a semiconductor bar is 0.068 V.

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2 years ago

I don’t get this question and i need help!!!

galina1969 [7]

i would say number 2

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If i wouldve know i would tell you sorry

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