Recent content by Alvin

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    Undergrad Measuring the absolute value of the AU

    How can they be sure that the value for the AU is 149,597,870 km? What methods are used to measure it?
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    Does light from a point source spread out?

    Part of a courseworky thing
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    Does light from a point source spread out?

    Do you no if the strength of the light follows any pattern or formula?
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    Does light from a point source spread out?

    I have been looking into the strenth of an infrared light source at different distances from a point source. My teacher said that the light would not spread out but when I looked on the internet i found something that said the strength was inversly proportional to square of the distance from...
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    Photodetector vs. Photosensor: Infrared Light & Point Source

    so does point sourc light spread out? so that the intensity is inversly proportional to the square of the distance from source?
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    Photodetector vs. Photosensor: Infrared Light & Point Source

    Help! is a photo detector the same as photosensor? can they be specifically for infrared light? and what does point source mean?