Quiz Answer Key and Fun Facts
1. LED stands for "Light Emitting Diode". The first two words are clear, but what is the origin and meaning of the word "diode"?
2. If you think of semiconductors, you will probably first think of silicon. However, very few LEDs actually contain silicon. Which semiconducting element is a major part of almost all of them?
3. The underlying physical process that triggers the light emission is called recombination, but which two things do recombine in this process, releasing energy in the form of light?
4. An LED converts electric energy into light, at a reasonably good rate. In fact, in theory, this process could almost be lossless. However, in practice, this goal is very hard to achieve because of which phenomenon?
5. Given the inevitable losses, how efficient can an LED be at converting electricity into light using late 2010s technology? For comparison, a standard light bulb gets about 2% and a halogen lamp can get up to 5%.
6. LEDs come in many different colors, but which color would you not be able to get if you have just a single semiconductor chip and no other components?
7. White LEDs meant for room illumination are often built using a phosphor material which absorbs the light emitted by the actual chip and then emits different wavelengths (colors) of light. What color LED chip is used in this kind of device?
8. If you take two identical LEDs and connect one to direct current and the other to alternating current of the same voltage, how will the two compare? (Assume the voltage is well within the specifications)
9. White LEDs - especially for decorative purposes - often come in variants designated "warm white" and "cold white". Which of the following statements is true regarding these designations?
10. Let's assume you put up two identical Christmas trees and decorate them with identical LED lights. You place one of them in your well-heated living room, the other outside in the freezing cold. Which of the following statements is true?
Source: Author
WesleyCrusher
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agony before going online.
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