White-light LEDs employ

A) phosphors.
B) white-emitting diodes.
C) extra-high electrical barriers.
D) none of the above


Answer: A

Physics & Space Science

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Answer the following statement(s) true (T) or false (F)


1. There is an electric field in the bar’s rest frame.
2. There is a magnetic field in the bar’s rest frame.

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Which of the following is true during the equinoxes?

A. The Sun is on the ecliptic. B. The Sun rises due east and sets due west. C. The Sun is on the Celestial Equator. D. All of these choices are correct.

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The primary function of any heat engine is to

A. destroy energy and replace it with work. B. convert heat into work. C. create a large amount of energy from a small amount of heat. D. create heat.

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Describe the rift valleys on Mars

What will be an ideal response?

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