cosmic rays - 2024 PACE NSC

Question

Theodor Wulf found initial evidence for these particles with an electrometer atop the Eiffel Tower. For 10 points each:

[10e] Name these “astroparticles” that reach Earth at near-light speeds. Victor Hess ascended three miles in a balloon to discover these “cosmic” particles.

ANSWER: cosmic rays

[10m] C. T. R. Wilson’s research atop Ben Nevis inspired his invention of these particle detectors in which charged particles leave paths as they move through supersaturated vapor.

ANSWER: Wilson cloud chambers

[10h] César Lattes’s placement of emulsion plates atop Chacaltaya was key in the discovery of these lightest hadrons. Charged examples of these mesons typically decay into a muon and muon neutrino.

ANSWER: pions [or pi mesons or pi plus mesons or pi minus mesons]

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Data

Team	Opponent	Part 1	Part 2	Part 3	Total
Alabama Cyber Tech	Maggie Walker C	10	0	10	20
Barrington	Innovation Academy B	10	10	0	20
Beavercreek	Saint Joseph	10	10	0	20
Belmont	Lightridge	10	0	10	20
Canyon Crest	Thomas Jefferson C	0	10	0	10
Cincinnati Hills	Kinkaid	0	0	0	0
Detroit Catholic Central A	Seven Lakes	10	10	0	20
Detroit Catholic Central C	Heights	0	0	0	0
Durham AT	Owensboro	10	10	10	30
Fairfield County AT	Thomas Jefferson D	0	0	0	0
Great Valley	DuPage County AT	0	0	0	0
Hoover A	Winston Churchill B	10	10	0	20
Hunter A	Georgetown Day	0	0	0	0
Innovation Academy A	Livingston B	0	0	10	10
Johns Creek B	William Fremd	0	10	0	10
Lambert	Maggie Walker B	0	0	0	0
Livingston A	James W. Robinson	0	10	10	20
McLean A	Carl Sandburg	0	0	0	0
McLean B	Chattahoochee	0	0	0	0
Mexico	Hoover B	0	0	10	10
Norfolk Academic Guild	Northmont A	0	0	0	0
Northmont B	St. Mark's	10	10	10	30
Okemos	Bloomington	0	0	0	0
Richard Montgomery A	Lindbergh	10	10	10	30
Richard Montgomery B	Johns Creek A	0	0	0	0
St. Thomas	Choate Rosemary Hall	0	0	0	0
St. Xavier	Maggie Walker A	10	0	0	10
Stevenson A	Carbondale	10	0	0	10
Stevenson B	Solon	0	0	0	0
Strake Jesuit	Elkhorn North	0	0	0	0
Thomas Jefferson A	West Point	10	10	0	20
Thomas Jefferson B	Freeman	10	10	10	30
University Lab	Detroit Catholic Central B	10	10	10	30
Walter Payton A	Hastings	0	10	10	20
Walter Payton B	Downingtown STEM	0	0	0	0
Winston Churchill A	Hunter B	0	10	0	10

Summary

Tournament	Edition	Exact Match?	Heard	PPB	Easy %	Medium %	Hard %
2024 PACE NSC	06/08/2024	Y	36	11.11	39%	42%	31%