query: How do we know the precise speed of light in a vacuum?
positive_passages.docid: 58728
positive_passages.text: Why does the speed of light in vacuum have no uncertainty?
negative_passages.docid: 80291
negative_passages.text: Relativistic velocity addition from time dilation
negative_passages.docid: 35663
negative_passages.text: Is there a formula that gives the position of an object depending on the time, but which doesn't allow the object to surpass the speed of light?
negative_passages.docid: 56297
negative_passages.text: What is the status of existing measurements of the speed of gravity?
negative_passages.docid: 155652
negative_passages.text: What are the calculations for Vacuum Energy?
negative_passages.docid: 22118
negative_passages.text: If all motion is relative, how does light have a finite speed?
negative_passages.docid: 66972
negative_passages.text: Is there any way to measure the one-way speed of light?
negative_passages.docid: 77578
negative_passages.text: How to get the accurate relativistic momentum form for photons?
negative_passages.docid: 19850
negative_passages.text: Why is the speed of light defined as 299792458 m/s?
negative_passages.docid: 148218
negative_passages.text: How precise must the energies match for absorption of photons?
negative_passages.docid: 119953
negative_passages.text: What is the meaning of speed of light $c$ in $E=mc^2$?
negative_passages.docid: 10781
negative_passages.text: Accelerating particles to speeds infinitesimally close to the speed of light?
negative_passages.docid: 127543
negative_passages.text: Determining the path of a light ray
negative_passages.docid: 56005
negative_passages.text: Speed of light travel
negative_passages.docid: 120679
negative_passages.text: Rømer's determination of the speed of light
negative_passages.docid: 47988
negative_passages.text: Reflection At Speed of Light
negative_passages.docid: 153488
negative_passages.text: How do you measure wavelength/frequency of light