What is a photoconductive cell (photo cell)?
What will be an ideal response?
The photoconductive cell (photo cell) is the oldest optoelectric device. It is a light-sensitive device in which the internal resistance changes with a change in light intensity. The resistance change is not proportional to the light striking it. The photo cell is made from light-sensitive material such as cadmium sulfide (CdS) or cadmium selenide (CdSe).
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A horse’s teeth should be checked about _____ per year
a. once c. three times b. twice d. four times
Residential concrete floors, patios, and walkways are typically placed as 36"-thick slabs.
Answer the following statement true (T) or false (F)
When installed in moderate- to high-risk seismic design zones, prefabricated foundations are installed on poured-in-place footings instead of crushed stone to provide more resistance to ____.
A. tornadoes B. floods C. moisture D. earthquakes
When delegating, the crew leader should make sure the crew member understands what to do and _____
a. the degree of risk involved b. has read the OSHA regulations c. who should be blamed if there is a problem d. their level of responsibility