Describe the optical properties of plastics and give examples.

What will be an ideal response?


Some plastics have optical properties equal to that of glass. Acrylics are as transparent as fine optical glass and have a light transmission of 92 percent. Polystyrene, polypropylene, and polycarbonates also exhibit transmission qualities of 90 percent or better.

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The mammary gland stops growing before the mammal reaches sexual maturity

Indicate whether the statement is true or false

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Explain the process involved in the artificial spawning of trout

What will be an ideal response?

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What is usually considered a minimum thickness for the valve margin?

What will be an ideal response?

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Ice-harvesting systems

A) use multiple banks of galvanized steel coils submerged underwater. B) use vertical refrigeration plates for building large sheets of ice. C) use well-insulated seamless polyethylene tanks containing spiral wound tube heat exchangers. D) use water-filled containers submerged in a tank of glycol solution.

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