Describe the relationship between IR frequencies and the visual portion of the electromagnetic spectrum.

What will be an ideal response?


Infrared radiation is a region of the electromagnetic spectrum which is located below the frequency of visible red light.

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Closed-loop, or ____________________, systems reuse the same heat transfer fluid, which is circulated in buried plastic pipes within the earth or within a lake or pond.

Fill in the blank(s) with the appropriate word(s).

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Match the part of the circle and its description.

A. center B. radius C. diameter D. arc E. chord F. circumference G. included angle

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A solution used as a secondary refrigerant in chillers consisting of water and a chemical which lowers the water's freezing point is called:

A) Brine. B) Propylene glycol. C) Hydraulic fluid. D) Slush.

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An air conditioning system should be pumped down (evacuated) for a minimum of ____ minutes.

A. 10 B. 20 C. 30 D. 60

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