Packet 1: Bonus 5
The bandwidth for this phenomenon dictates whether one may use the Rayleigh–Jeans or Wien approximations. For 10 points each:
[10e] Name this phenomenon described by Planck’s law, in which it is absorbed and emitted by blackbodies.
ANSWER: electromagnetic radiation [or light; or electromagnetic waves]
[10m] In 1860, this physicist defined the blackbody, which he then used to derive a law equating emissivity and absorptivity at equilibrium. This German physicist also names three laws describing the emission spectra of gases.
ANSWER: Gustav Kirchhoff [or Gustav Robert Kirchhoff]
[10h] Planck’s derivation of Kirchhoff’s law of radiation uses Helmholtz’s formulation of this principle, which states that in a passive medium, light intensity remains the same if its direction is reversed. This electromagnetic principle states that sources and receivers can be interchanged while maintaining certain properties.
ANSWER: electromagnetic reciprocity [accept Stokes–Helmholtz reciprocity]
<NYU A, Physics> | I1. Prelims Tiebreaker - NYU A + NYU B + Case Western (Tiebreaker Half 1)
| Heard | PPB | E % | M % | H % |
|---|---|---|---|---|
| 1 | 10.00 | 100% | 0% | 0% |