Question

((((--Please type the answers because it is difficult to read different hand writings! ))))

A- Why do we use electronic and computerized instrumentation in this laboratory, and not something less complex?

B- In your own words, explain the main difficulty that arises with the use of electronic and computerized instrumentation. Why do you think it is important to acknowledge this difficulty?

C- Again, in your own words, explain the two things you need to do in order to get good data when using computerized (or any other) instrumentation.

D-The Motion Sensor works on the principle of echolocation. Describe how the sensor uses this to determine distances. Include the equation distance = speed time as part of your answer.

Thank you!

Answer 1

A
The computerised instrument has made many advances in laboratory analysis. The large volumes of data generated by instruments is difficult to evaluated on paper, but have become much easier to deal with once desktop PCs were available to researchers.
They Improved analytical capabilities. Analyses not manually practical, can be easily done by a computer Graphs and Charts also available.

B
Computers’ limitations should be and they are not designed for automatic information generation or processing. An operator required to make data-entry or supp information to computers error can give wrong or incomplete info or sometimes erase it and manual becomes necessary. Mistakes can repetitive if not corrected in time.
Computers can suggest references to doc but They cannot eliminate the need to go these documents to locate the re information.
A typical virus can wash out all info stored in the computer. Then retrieval restoration of data becomes necessary.

D
An ultrasonic wave (sound at a frequency higher than a human ear can hear) is emitted and reflections from nearby objects are received. Exactly as in Doppler radar, heterodyne detection of the received field indicates motion. The detected doppler shift is also at low audio frequencies since the ultrasonic wavelength of around a centimeter is similar to the wavelengths used in microwave motion detectors. One potential drawback of ultrasonic sensors is that the sensor can be sensitive to motion in areas where coverage is undesired, for instance, due to reflections of sound waves around corners. Such extended coverage may be desirable for lighting control, where the goal is detection of any occupancy in an area or distance.