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Darina [25.2K]
3 years ago
5

As a general rule of thumb, the ratio of the rate of etch-product formation to the flow rate of etch gas should be greater than

0.1 for uniform etching. Suppose a 7.5-cm diameter silicon wafer is etched at a rate of 50 nm/min in a CF4 plasma.
(a) How many atoms of Si are removed per minute?
(b) What evolution rate of SiF4 does this correspond to in standard cubic centimeters per minute (sccm)?
(c) What minimum CF4 flow rate should be maintained?

Engineering
1 answer:
g100num [7]3 years ago
8 0

Answer:

The solution and complete explanation for the above question and mentioned conditions is given below in the attached document.i hope my explanation will help you in understanding this particular question.

Explanation:

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Which explanation best identifies why the company in the following scenario has decided against investing in solar energy?
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The company found the cost of the required photovoltaic cells too expensive.

Explanation:

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The cost required is starting a solar system is very high because one needs to buy solar panel, photovoltaic cells for batteries, inverters and so on.

From the question, the company decided against solar energy for the time being. This means that probably in the future they might consider it. Therefore it is as a result of the economic situation of the company that they have not set up a solar system because the cost of the required photovoltaic cells too expensive.

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3 years ago
Identify the Levels of Biological Organization below. Copy and answer each statement. Write
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Answer:

no idea

Explanation:

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Engineering is the use of scientific principles to design and build machines, structures, and other items, including bridges, tu
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Is this a question or a statement?

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In the dataset "RestRating", the 30 randomly selected patrons give the overall dining experience ratings (Outstanding, Very good
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6 0
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The mass fractions of total ferrite and total cementite in an iron–carbon alloy are 0.91 and 0.09, respectively. Is this a hypoe
WINSTONCH [101]

Answer:

hypoeutectoid

Explanation:

ferrite:  pure form of iron

cementite: It is iron carbide with 93.3% iron and 6.67% carbon

hypoeutectoid: Eutectoid steel with carbon fraction less than 0.8%

hypereutectoid: Eutectoid Steel with carbon content more than 0.8%

For the mentioned iron-carbide alloy,

% of carbon in iron-carbide alloy= percentage of cementite × percentage of carbon in cementite

% of carbon in iron-carbide alloy= 0.09× 0.0667

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so the alloy is hypoeutectoid

4 0
4 years ago
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