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The Real Sonic Screwdriver

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Thursday Apr 19, 2012 14:24

Dr. Who fans....LOOK. :) "A real "Sonic Screwdriver" has been used to lift and spin a free-floating 10 cm rubber puck. Energy beams, such as ultrasound or laser beams, carry momentum that can be used to push objects in the path of the beam, or even rotate objects if it is a vortex beam. The helical wavefronts of vortex beams mean there is a rotating, or angular component of momentum that can exert a torque on an object. " Via