Answer:
c is correct answer my girl f
The correct answer is: [D]: "S" (sulfur).
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<u>Note</u>: The other answer choices:
[A]: "K" (potassium) ;
[B]: "Na" (sodium) ;
[C] "Mg" (magnesium) ;
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are all metals.
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Answer choice: [D]: "S" (sulfur) ; is NOT a metal; and may exist in gaseous form.
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The word is 'Observation'. It fits the given definition, begins with the letter 'O' and is 11 letters long.
Answer:
An LED light uses one-third the energy of an incandescent bulb to produce the same amount of light.
Step-by-step explanation:
A typical 100 W incandescent bulb produces about <em>5 % visible light</em>, 83 % IR radiation, and 12 % heat (it is the IR radiation that makes the bulb feel hot).
It produces about 5 J of light energy for every 100 J of energy input.
A typical LED bulb produces about <em>15 % visible light</em> and 85 % heat (LEDs feel cool, because they don't produce IR radiation).
It produces about 15 J of light energy for every 100 J of energy input.
Thus, an LED light is about three times as efficient at converting electrical energy into light