[XL | t++ | ***] inverse square law, luminosity
What it shows: The intensity of light from a point source decreases as 1/r2, where r is the distance from the source.
How it works: For the point light source, we use a 1500 watt clear light bulb. The detector is a small solar panel.1 The output current is directly proportional to the intensity of the light falling on the panel and the current is displayed on an analog milliameter. (The current can also be measured by a digital meter or computer.) Measured...
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