query: Measuring the speed of light?
positive_passages.docid: 19850
positive_passages.text: Why is the speed of light defined as 299792458 m/s?
negative_passages.docid: 22402
negative_passages.text: If I am travelling on a car at around 60 km/h, and I shine a light, does that mean that the light is travelling faster than the speed of light?
negative_passages.docid: 128965
negative_passages.text: Photon pair production at relativistic speeds?
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: 13757
negative_passages.text: Is there a device that could measure the speed of time?
negative_passages.docid: 141866
negative_passages.text: The lightest photon ever detected
negative_passages.docid: 11053
negative_passages.text: Planck's Law in terms of wavelength
negative_passages.docid: 45888
negative_passages.text: Minkowski metric -- why does it follow from the constancy of the speed of light?
negative_passages.docid: 22436
negative_passages.text: How is a second measured? And why is it measured that way?
negative_passages.docid: 67327
negative_passages.text: Does this count as moving faster than light?
negative_passages.docid: 27593
negative_passages.text: Why is travelling around the speed of light a problem?
negative_passages.docid: 47568
negative_passages.text: Is it experimentally proven that photons travel at speed $c$ in vacuum?
negative_passages.docid: 93598
negative_passages.text: Is it proven experimentally that the speed of causality (light) is the maximum speed?
negative_passages.docid: 120679
negative_passages.text: Rømer's determination of the speed of light
negative_passages.docid: 15372
negative_passages.text: How does light know which path is fastest?
negative_passages.docid: 155345
negative_passages.text: Can we use curved spacetime to measure the one-way speed of light?
negative_passages.docid: 974
negative_passages.text: Speed of light in a gravitational field?