Question: We see several different demos using the radiometers. What is something that we learn? Question 5 options: The radiometer vanes turn as if pushed on

We see several different demos using the radiometers. What is something that we learn?
Question 5 options:
The radiometer vanes turn as if pushed on the black side when heated, but they turn the other way when cooled.
The brighter the lamp used, the faster the radiometer vanes spin.
The radiometer vanes are pushed by the photon pressure of the incident radiation.
The radiometer vanes always turn as if pushed on the black sides, which are always hotter.

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