Packet D: Bonus 19
The standard model of these objects is the Shakura–Sunyaev model. For 10 points each:
[10e] Name these circular regions of material that often form around compact objects like black holes.
ANSWER: accretion disks [prompt on disks]
[10m] The Shakura–Sunyaev model is a model of thin disks efficient at this process, in contrast to ADAF (“A-D-A-F”) disks. The pressure of this phenomenon equals a body’s self-gravity at the Eddington limit.
ANSWER: radiation [or word forms like radiate; accept radiation pressure; accept photon emission; accept answers specifying (the production of) photons or light or electromagnetic waves]
[10h] The Shakura–Sunyaev model also makes this common radiative assumption typically known by a three-letter acronym. Under this simplifying assumption, the source function of the radiative transfer equations depends only on temperature.
ANSWER: local thermodynamic equilibrium [or LTE; prompt on partial answers]
<GC, Other Science> | Packet D - UBC B, Oxford A, Waterloo B, CWRU A
| Heard | PPB | E % | M % | H % |
|---|---|---|---|---|
| 17 | 11.76 | 94% | 24% | 0% |
Conversion
Summary
| Tournament | Edition | Match | Heard | PPB | E % | M % | H % |
|---|---|---|---|---|---|---|---|
| California (North) | Main Site | ✓ | 3 | 16.67 | 100% | 67% | 0% |
| California (South) | Main Site | ✓ | 1 | 10.00 | 100% | 0% | 0% |
| Great Lakes | Main Site | ✓ | 1 | 10.00 | 100% | 0% | 0% |
| Lower Mid-Atlantic | Main Site | ✓ | 1 | 10.00 | 100% | 0% | 0% |
| Midwest | Main Site | ✓ | 2 | 10.00 | 100% | 0% | 0% |
| Northeast | Main Site | ✓ | 1 | 10.00 | 100% | 0% | 0% |
| Overflow | Main Site | ✓ | 2 | 5.00 | 50% | 0% | 0% |
| Southeast | Main Site | ✓ | 1 | 10.00 | 100% | 0% | 0% |
| UK | Main Site | ✓ | 3 | 16.67 | 100% | 67% | 0% |
| Upper Mid-Atlantic | Main Site | ✓ | 2 | 10.00 | 100% | 0% | 0% |