Physics, 05.07.2019 00:10 serenityburke
Many physical quantities are connected by inverse square laws, that is, by power functions of the form f(x)=kx^(-2). in particular, the illumination of an object by a light source is inversely proportional to the square of the distance from the source. suppose that after dark you are in a room with just one lamp and you are trying to read a book. the light is too dim and so you move halfway to the lamp. how much brighter is the light?
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