Problem: The attainment of high efficiency in blue LEDs was quickly followed by the development of the first white LED. In this device a Y
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12:Ce (known as "YAG") phosphor coating on the emitter absorbs some of the blue emission and produces yellow light through fluorescence. The combination of that yellow with remaining blue light appears white to the eye. However using different phosphors (fluorescent materials) it also became possible to instead produce green and red light through fluorescence. The resulting mixture of red, green and blue is not only perceived by humans as white light but is superior for illumination in terms of color rendering, whereas one cannot appreciate the color of red or green objects illuminated only by the yellow (and remaining blue) wavelengths from the YAG phosphor.
What does the YAG phosphor coating produce?
The answer is the following: yellow light

Problem: Outside of the Low Countries, it is the native language of the majority of the population of Suriname, and also holds official status in the Caribbean island nations of Aruba, Curaçao and Sint Maarten. Historical minorities on the verge of extinction remain in parts of France and Germany, and in Indonesia,[n 1] while up to half a million native speakers may reside in the United States, Canada and Australia combined.[n 2] The Cape Dutch dialects of Southern Africa have evolved into Afrikaans, a mutually intelligible daughter language[n 3] which is spoken to some degree by at least 16 million people, mainly in South Africa and Namibia.[n 4]
It's been estimated that up to what number of native Dutch speakers live in Australia, the U.S., and Canada?
The answer is the following: half a million

Problem: Among the philosophies that have influenced modern architects and their approach to building design are rationalism, empiricism, structuralism, poststructuralism, and phenomenology.
What are some philosophies that modern architects use?
The answer is the following: rationalism, empiricism, structuralism, poststructuralism, and phenomenology.

Problem: Reflections generally affect polarization. For radio waves, one important reflector is the ionosphere which can change the wave's polarization. Thus for signals received following reflection by the ionosphere (a skywave), a consistent polarization cannot be expected. For line-of-sight communications or ground wave propagation, horizontally or vertically polarized transmissions generally remain in about the same polarization state at the receiving location. Matching the receiving antenna's polarization to that of the transmitter can make a very substantial difference in received signal strength.
What mostly affects polarization?
The answer is the following:
Reflections