52. Solder is a mixture of tin and lead. The melting point of
tin is 232 ◦C and
that of lead is 327 ◦C. The melting point for solder
(depending on the mixing
fractions) generally lies in the range 180 ◦C to 200 ◦C. Why
is the melting
point of the mixture lower than that of either
ingredient?
Traditional solder is a low melting point alloy of lead and tin.
(Some countries havemandated the future use of lead-free solders,
because of concerns relating to theenvironmental consequences of
lead use and disposal.) Using appropriate data gleaned from the
textbook, explain
(i) why lead has very limited solubility in solid tin
(hardly any lead will dissolve in tin at room temperature);
(ii) why tin is moderately soluble in solid lead (approximately
3.5% of the atoms in lead can be
replaced by...
Failure times of silicon wafer microchips. Researchers at
National Semiconductor experimented with tin-lead solder bumps used
to manufacture silicon wafer integrated circuit chips. The failure
times of the microchips (in hours) were determined at different
solder temperatures (degrees Centigrade). The data for one
experiment are saved in WAFER file. The researchers want to predict
failure time (y) based on solder temperature (x). a. Construct a
scatterplot for the data. What type of relationship, linear or
curvilinear, appears to exist between...
4. What was the composition of the purchase price? Why was this
composition selected according to this case study?
5. Where are these companies today in terms of companies and
also their stock prices?
6. How is the auto industry doing recently during the Covid-19
crisis? Be specific and Provide an example and your opinion
Why is it possible to use molecular entities (discrete or polymeric) to replace electronic components based on silicon? How are their similar electronic properties explained?
What are the advantages and disadvantages of materials for molecular electronics compared to traditional silicon-based electronics?
a) Explain why the Cell processor is the best choice for the
Mayo Clinic’s tasks?
b) In what other industry and scenario might the time play an
important role when it comes to processing? Explain how reducing
minutes to seconds has an impact in such a scenario.