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The electromagnetic spectrum is the range of all frequencies of electromagnetic radiation.

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Modern laptops and tablets usually have a built-in internal Wi-Fi wireless card. But certain desktop computers may require a Wi·Fi USB adapter or a Wi·Fi network card. Wi-Fi signals will usually reach about 150 feet or over 45 meters for a 2.4Ghz frequency

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Wi-Fi routers: receive the signal from the line provided by the telephone cornpany and distribute it to the Wi-Fi receiver devices within their reach.

Wireless access points (WAP): act as remote transmitters: they are used in locations that the router's Wi-Fi signal cannot reach.

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TVs, radio, cell phones, microwaves, night vision goggles, scientific spectrometer instruments, x-ray machines, CAT scans, MRI imagers

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Bluetooth relies on short-range radio frequency. When Bluetooth-enabled devices are close to each other, they automatically detect each other.

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any device that incorporates the technology can communicate as long as it is within the required distance, which gives them a range of about 33 feet.

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This technology is normally used by personal computing devices, such as mobile phones and laptops.

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Infrared technology uses a transmission technique based on the light waves that move within the infrared spectrum.

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The maximun distance is one metre.

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Infrared cameras, night vision devices, infrared remote controls and infrared ports for computers.