Physics, 16.07.2019 04:40 amanda2517
Use multiple infrared beams that are aimed across a doorway and positioned so that as a person walks through the doorway some beams are activated.
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Physics, 21.06.2019 19:00
When the velocity of an object is doubled, by what factor is its momentum changed? by what factor is its kinetic energy changed? a) the momentum is zero. b) the momentum is not zero. c) difficult to say.
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Physics, 22.06.2019 12:00
Infrared radiation has wavelengths that are shorter than visible light is part of the visible light spectrum has wavelengths that are longer than visible light has the same wavelengths as ultraviolet radiation
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Physics, 22.06.2019 17:00
Amajor difference radio waves, visible light, and gamma rays is the of the photons, which results in different photon frequencies and wavelengths
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Use multiple infrared beams that are aimed across a doorway and positioned so that as a person walks...
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