Intensity of light proportional to 1/r2
Experiment no.: 5.5.8
The intensity of light from a point-like source increases quadratically with the distance r from the source. This follows from the conservation of energy and from the three spatial dimensions.
For comparison, the experiment can also be done with a laser.
Comment: The video shows an out-dated set-up.
For comparison, the experiment can also be done with a laser.
Comment: The video shows an out-dated set-up.
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Light emission in solid angle