In science fiction laser/energy weapons are depicted as having no recoil (such as a phaser in Star trek.) Now my question: If humans were to develop energy weapons would they actually be recoil-less or would they have recoil? The reason I'm asking is because physics isn't my strong suit.
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Photons don't have mass. Recoil is caused by an equal and opposite reaction of the bullet leaving the gun. Since f=ma and photons have no mass, there would be no force. So no, a laser gun wouldn't have a recoil.