query: Where does light get its speed from?
positive_passages.docid: 41041
positive_passages.text: Does a photon instantaneously gain $c$ speed when emitted from an electron?
negative_passages.docid: 13563
negative_passages.text: What really causes light/photons to appear slower in media?
negative_passages.docid: 66972
negative_passages.text: Is there any way to measure the one-way speed of light?
negative_passages.docid: 47988
negative_passages.text: Reflection At Speed of Light
negative_passages.docid: 90476
negative_passages.text: Why can light (photons) bends in a curve through space without mass?
negative_passages.docid: 142906
negative_passages.text: How can a particle in a medium ever travel faster than light?
negative_passages.docid: 141546
negative_passages.text: Time and distance in a photon's frame of reference
negative_passages.docid: 7618
negative_passages.text: What is the speed of light relative to?
negative_passages.docid: 126955
negative_passages.text: How do we see? Where do the photons disappear?
negative_passages.docid: 81663
negative_passages.text: Why does gravity travel at the speed of light?
negative_passages.docid: 12267
negative_passages.text: (Almost) double light speed
negative_passages.docid: 154151
negative_passages.text: How do single photons travel from here to there
negative_passages.docid: 64508
negative_passages.text: Where exactly does energy quantisation come in for light?
negative_passages.docid: 137951
negative_passages.text: What changes occur while an atom approches the speed of light?
negative_passages.docid: 58728
negative_passages.text: Why does the speed of light in vacuum have no uncertainty?
negative_passages.docid: 20086
negative_passages.text: Why is the amount of light a lens lets in called the 'lens speed'?
negative_passages.docid: 8367
negative_passages.text: What do physicists mean when they say "speed of light"?