Crookes Radiometer - A Light Mill

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The Crookes radiometer, also known as a light mill, consists of an airtight glass bulb, containing a partial vacuum. Inside are a set of vanes which are mounted on a spindle. The vanes rotate when exposed to light, with faster rotation for more intense light, providing a quantitative measurement of electromagnetic radiation intensity.
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Hello. My radiometer stops after some time, even when it is standing in a sunny window. I do not know why this is happening.

kriswolf
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too much friction on the point or the partial vacuum has changed try hitting it with a strong green laser 5 milliwatts my two radiometers still work one is made in 1970

TheHulabob