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Photo-radar is the Canadian term for a road-rule enforcement camera that enforces speed.

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Topics: Photo-radar, Photon, Photoelectric Effect, Photography...

PhotonFor the Japanese anime video, see Photon (anime). In physics, the photon (from Greek φοτος, meaning light is a quantum of excitation of the quantised electromagnetic field and is one of the elementary particles studied by qu	Photoelectric effectThe photoelectric effect is the emission of electrons from a surface (usually metallic) upon exposure to, and absorption of, electromagnetic radiation (such as visible light and ultraviolet radiation) that is above the threshold frequency particular to ea	PhotographyPhotography is the technique of recording, by chemical, mechanical or digital means, a permanent image on a layer of material sensitive to light exposure. The word comes from the Greek words φως phos ("light"), and γρα&phi
PhotolithographyPhotolithography is a process used in semiconductor device fabrication to transfer a pattern from a photomask (also called reticle) to the surface of a wafer or substrate. It bears a similarity to the conventional lithography used in printing. Lithography	PhotoresistPhotoresist is a light sensitive material used in the process of photolithography to form a patterned coating on a surface. Photoresists are classified into two groups, positive resists in which the exposed areas become more sensitive to chemical etching	PhotosynthesisPhotosynthesis is a biochemical process in which plants, green algae, and some bacteria use the energy of light to combine water and carbon dioxide into oxygen and energy. It nourishes nearly all living things directly or indirectly, making it vital to li
Photosynthetic pigment	Photograph	Photosphere
Photomontage	Photocurrent	Photodiode
Photographic film	Photophone	Photoconductivity