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Radar is the acronym for Radio detecting and ranging.
All of them are. Every color that your eye is capable of detecting is in the rainbow. That's an infinite number. (I said 'detecting', not 'distinguishing' or 'differentiating'.)
A PET scan would be most useful for detecting brain areas that are most active as a person performs mathematical calculations.
they are great at detecting pregnancy early
Photoelectric detectors are best used for detecting smoke and fire in various settings such as homes, offices, and public buildings. These detectors work by detecting the presence of smoke particles in the air, triggering an alarm and allowing prompt action to be taken. They are particularly effective in detecting smoldering fires, which may produce more smoke before flames are visible.