Figure 1 The Large Hadron Collider (LHC) at CERN in Geneva, in which protons and antiprotons will be accelerated to nearly the speed of light and smashed together in giant particle detectors. The velocities are so high, the classical equations for momentum and energy do not work; the correct relativistic equations have to be used.
Maximilien Brice/CERN
Thinking carefully about the meanings of mass, momentum and energy, and using equations of special relativity, helps answer some puzzling questions about light and fast particles.
Have any of the following questions occurred to you while learning about particles, light or quantum phenomena?
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