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  2. Electromagnetic spectrum - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_spectrum

    By definition, visible light is the part of the EM spectrum the human eye is the most sensitive to. Visible light (and near-infrared light) is typically absorbed and emitted by electrons in molecules and atoms that move from one energy level to another. This action allows the chemical mechanisms that underlie human vision and plant photosynthesis.

  3. Remotely Operated Auto Racers - Wikipedia

    en.wikipedia.org/wiki/Remotely_Operated_Auto_Racers

    Remotely Operated Auto Racers (formerly known as Radio Operated Auto Racing), abbreviated as ROAR, is the sanctioning body of competitive radio-controlled car racing in the United States and Canada. It is a US national non profit organization that promotes the sport of radio controlled model car racing.

  4. Pilot light - Wikipedia

    en.wikipedia.org/wiki/Pilot_light

    Now it is more common to light a burner electrically, but gas pilot lights are still used when a high energy ignition source is necessary, as in when lighting a large burner. A United States patent was filed May 13, 1922, for a "safety gas-control system" by two employees of the Newark, New Jersey–based Public Service Gas Company, Conrad ...

  5. Remote controlled weapon station - Wikipedia

    en.wikipedia.org/wiki/Remote_controlled_weapon...

    A remote controlled weapon station (RCWS), remotely operated weapon system (ROWS), or remote weapon system (RWS), is a remotely operated light or medium-caliber weapon system, often equipped with a fire-control system, that can be installed on a ground combat vehicle or sea- and air-based combat platform.

  6. Emergency light - Wikipedia

    en.wikipedia.org/wiki/Emergency_light

    An emergency light is a battery-backed lighting device that switches on automatically when a building experiences a power outage. In the United States, emergency lights are standard in new commercial and high occupancy residential buildings, such as college dormitories , apartments , and hotels .

  7. Wireless microphone - Wikipedia

    en.wikipedia.org/wiki/Wireless_microphone

    Singer Sophia Abrahão using a handheld wireless microphone Singer Cody Simpson using a wireless microphone headset in a 2013 concert in Montreal. A wireless microphone, or cordless microphone, is a microphone without a physical cable connecting it directly to the sound recording or amplifying equipment with which it is associated.

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