This is an electromagnetic radiation. You can't see it but it's there. In fact, it' everywhere, but here's a more reliable form. This is a color sign but more accurately. This is waves of electromagnetic radiation oscillating at about six hundred 616,856,909,465,021 times per second, as they reach your eyes, light receptive cells translate the radiation into electrical signals, which traveled to your brain and are generally perceived as the color that we collectively referred to as cyan.
If we strip away our interpretation though the radiation scaled up about 100,000 times looks like this, the color cyan is waves of energy roughly 486 nanometers wide but what happens if that width Titans at 380 nanometers, our perception changes to this dark purple.
Meanwhile, if it expands to a roomy 780 NM our brains interpret the radiation as this shade of dark red essentially as the wavelength changes so too do the properties. So what happens if we change the wavelength more dramatically like tightening its by 100 times.
Well, now the waves have much higher energy. They're much more powerful so much so that they can actually pass through some less dense materials like Fabric or human tissue, but they aren't quite strong enough to pass through denser materials like metal or both.
You can see where this is going, we refer to these wavelengths as X-rays and use their special properties to look inside bags at airport, security and inside humans at the hospital. So what happens at the other end of the spectrum?
What If instead of the width of human DNA, the waves were the width of humans. Well, this is what we refer to as an ultra high frequency radio wave its comparatively enormous wave length allows it to travel over huge distances, pass through obstructions, and even bend around obstacles. All useful properties if you wanted to use electromagnetic radiation to say communicate.
Of course, in order to convey information. Using a radio wave we need a way to manipulate the radio wave that corresponds to the desired information. For this, there are options to start with.
There's the strength of the wave. We know that a blue light, for example can be weak or strong but no matter if its weak or strong, it's still blue and the fact that it's blue means that it's still fundamentally the same wavelength of electromagnetic radiation, the same principle applies up the Spectrum with radio waves.
They can be powerful weak or anywhere in between and still be the same wavelength. In this context, we call that strength the amplitude therefore we can transmits an audio signal. For example, by modifying that amplitude by a proportional amount. The receiver just needs to know how to interpret those amplitude modulations and translate them back to an audio signal in the case of an AM radio station.
The radio receiver only focuses on the the radiation with a wavelength 1119 feet or 341 meters longs. That,s a big reason why AM radio tends to be lower quality and a big reason why it's not as useful a technique for transmitting bigger chunks of data. Of course, the wavelength can also be manipulated, that means that we can essentially do the same thing.
But this time by ever so slightly modifying the distance between waves in this context would refer to this as the frequency which is proportional to wavelength.
But rather than being a physical measure, its temporal one, how many times the wave oscillates with in a second? So by slightly modulating frequency, we can transmit the same audio signal but since this method is less susceptible to interference, we can generally get higher quality, Bill traditional radio works by encoding.
The audio signal is self into radio waves, using amplitude or frequency modulation, but computers phones essentially, everything digital, nowadays encodes, its data into binary code sequences of ones and zeros, this only makes communication using electromagnetic radiation better.
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