Have you ever noticed that light is not actually required for playing Quizbowl? To rectify this, answer some questions about light, for 10 points each:
[10e] Light is a wave traveling in this field. This field can be described by a rank-2 antisymmetric tensor field F, or, more simply, by two vector fields symbolized E and B.
ANSWER: electromagnetic field [or EM field or EMF; accept answers containing both electric AND magnetic fields; prompt on partial answer]
[10h] The stress-energy tensor of an electromagnetic field is symmetric and has this property, meaning that the energy density minus the pressures is zero everywhere. This property is written “T sub a sup a equals zero.”
ANSWER: traceless [or zero trace; accept any description stating that the trace is zero or vanishes]
[10m] The time-space components of the stress-energy tensor, times c, describe this 3-vector. This vector field can be used to calculate the direction and intensity of a light beam, though it may need to be time-averaged over a cycle.
ANSWER: Poynting vector [prompt on S]
<RA, Physics>