Bonus
Albert Fert and Peter Grünberg discovered that this quantity depends on the magnetic field applied to iron chromide superlattices, leading to the development of spintronics. For 10 points each:
[10e] Name this quantity that equals voltage over current by Ohm’s law.
ANSWER: resistance [accept magnetoresistance or giant magnetoresistance; prompt on R]
[10m] Leo Esaki developed a type of these devices that achieves negative resistance due to quantum tunneling. On circuit diagrams, these devices are symbolized by a triangle pointing at a vertical line.
ANSWER: diodes [accept Esaki diodes]
[10h] In this effect, a “supercurrent” flows through a weak link at the junction between two superconductors. SQUIDs, which detect extremely small magnetic fields using this effect, are often used in dark matter detection experiments.
ANSWER: Josephson effect [accept Josephson junctions]
<Editors, Physics>
| Editions | Heard | PPB | Easy % | Medium % | Hard % |
|---|---|---|---|---|---|
| 2 | 103 | 17.28 | 94% | 63% | 16% |
Conversion
Summary
| Tournament | Edition | Exact Match? | Heard | PPB | Easy % | Medium % | Hard % |
|---|---|---|---|---|---|---|---|
| UK (North) | UK | Y | 5 | 22.00 | 100% | 100% | 20% |
| UK (South) | UK | Y | 8 | 18.75 | 100% | 88% | 0% |
| Northern California | US | Y | 4 | 17.50 | 100% | 75% | 0% |
| Southern California | US | Y | 7 | 21.43 | 100% | 86% | 29% |
| Eastern Canada (1) | US | Y | 4 | 15.00 | 75% | 50% | 25% |
| Eastern Canada (2) | US | Y | 9 | 13.33 | 89% | 11% | 33% |
| Florida | US | Y | 4 | 7.50 | 75% | 0% | 0% |
| Great Lakes | US | Y | 11 | 18.18 | 100% | 73% | 9% |
| Lower Mid-Atlantic | US | Y | 9 | 16.67 | 89% | 56% | 22% |
| Upper Mid-Atlantic | US | Y | 9 | 17.78 | 100% | 56% | 22% |
| Midwest | US | Y | 9 | 17.78 | 100% | 67% | 11% |
| North | US | Y | 4 | 12.50 | 75% | 50% | 0% |
| Pacific | US | Y | 8 | 21.25 | 100% | 88% | 25% |
| Southeast | US | Y | 11 | 16.36 | 91% | 64% | 9% |
| Upstate NY | US | Y | 1 | 20.00 | 100% | 100% | 0% |