ATMO 336 Lecture Notes - Lecture 12: Dowsing, Photon, Kyoto Protocol

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Tra(cid:448)els through outer spa(cid:272)e at the (cid:862)speed of light(cid:863) (300,000 km/sec) Visible light is the type of radiation that can be sensed by our eyes. Different types of radiation can be described by the energy carried by a single photon. Radiation energy emitted by one object is delivered to another object when that object absorbs the radiation energy. O(cid:271)je(cid:272)ts (cid:374)ear the te(cid:373)perature of the earth"s surfa(cid:272)e are (cid:374)ot hot e(cid:374)ough to e(cid:373)it a(cid:374)y (cid:448)isi(cid:271)le radiatio(cid:374) and can only be seen by reflected light. The electric heating coil is hot enough to emit some visible radiation, showing as a glowing red. The sun emits all colors of visible photons, which we perceive as white light. The sun has a temperature near 6000 k, while the earth has a temperature at 288k. By measuring the radiation energy emitted by an object, we can determine its temperature.

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