Have you ever noticed how helicopter propellers sometimes appear to move in slow motion, stand still, or even move backward in videos? This fascinating illusion is caused by the stroboscopic effect, where the frame rate of the camera interacts with the rapid rotational speed of the blades. When the propeller's rotation aligns with or is slightly out of sync with the camera's frames per second, it creates this strange phenomenon.
What’s really happening? The propellers are spinning incredibly fast, but the camera only captures specific moments of their movement, making it look like they’re defying physics. Have you seen this in real life?
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