electronvolt - 2024 ACF Winter

Question

The Oh-My-God particle, an ultra-high-energy cosmic ray detected in 1991, had an estimated energy of 320 exa-[this unit]. For 10 points each:

[10m] 13.6 of what unit is the energy needed to ionize a hydrogen atom? A hartree is equal to 27.2 of this unit.

ANSWER: electronvolt [or electron volts; or eV; reject “electron” or “volt”]

[10e] The ionization energy of hydrogen being equal to 13.6 electronvolts is determined using this Danish physicist’s model of the atom, which puts electrons in discrete orbitals.

ANSWER: Niels Bohr

[10h] The hydrogen atom’s radial eigenfunctions are this set of orthogonal polynomials named for a Frenchman. They are solutions of the equation [read slowly] “x times y-double-prime, plus one-minus-x times y-prime, plus ny equals zero.”

ANSWER: Laguerre polynomials

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Summary


2024 ACF Winter at Clemson	2024-11-16	Y	1	10.00	100%	0%	0%
2024 ACF Winter at Lehigh	2024-11-16	Y	6	13.33	100%	17%	17%
2024 ACF Winter at Northwestern	2024-11-16	Y	9	21.11	100%	78%	33%
2024 ACF Winter at Ohio State	2024-11-16	Y	7	18.57	100%	71%	14%
2024 ACF Winter at Online	2024-11-16	Y	8	12.50	100%	25%	0%
2024 ACF Winter at UBC	2024-11-16	Y	3	20.00	100%	100%	0%
2024 ACF Winter at Central Florida	2024-11-16	Y	5	14.00	80%	60%	0%
2024 ACF Winter at Brandeis	2024-11-16	Y	8	18.75	100%	63%	25%

Data


Indiana A	UChicago A	10	10	10	30
UIUC C	Miami	10	10	0	20
Purdue A	Northwestern A	10	10	0	20
Notre Dame	WashU C	10	10	0	20
UChicago D	Purdue B	10	10	0	20
Alberta	SFU	10	10	0	20
UBC B	UBC A	10	10	0	20
UW A	UW B	10	10	0	20
UF A	Florida State University A	10	10	0	20
Bard A	Penn A	0	10	0	10
Columbia A	Haverford A	10	10	10	30
Columbia B	Lehigh A	0	10	0	10
Penn State A	Princeton A	0	10	0	10
Rutgers A	Rowan A	0	10	0	10
Rutgers C	Johns Hopkins B	0	10	0	10
Central Oklahoma	NYU B	10	10	0	20
Mississippi State	Oregon State	0	10	0	10
NYU A	Missouri	0	10	0	10
Iowa	Texas A	0	10	0	10
Colorado College	Texas D	0	10	0	10
Texas B	Vassar A	0	10	0	10
Vassar B	Texas C	0	10	0	10
WUSTL A	McGill E	10	10	0	20
Auburn A	Georgia Tech B	0	10	0	10
Indiana B	SIUE A	0	10	0	10
UIUC A	UIUC B	10	10	10	30
UChicago C	UIUC D	10	10	10	30
WashU D	UChicago B	0	10	0	10
Pitt B (UG)	CWRU B (UG)	0	10	0	10
Kenyon A (UG)	Kenyon B (DII)	10	10	0	20
Pitt A	Michigan A	10	10	0	20
Michigan B	Michigan State A	10	10	0	20
Michigan C (UG)	Ohio State C (DII)	10	10	0	20
Michigan State C (UG)	CWRU D (DII)	0	10	0	10
Ohio State A (UG)	Ohio State B (DII)	10	10	10	30
UF C	UCF B	10	10	0	20
UCF A	UF D	10	10	0	20
Florida Tech B	UF E	0	10	0	10
UF F	Florida Tech A	0	0	0	0
Amherst A	Boston University B	10	10	0	20
Clark A	Boston University A	0	10	0	10
Yale B	Bowdoin B	10	10	0	20
Brown A	Tufts A	0	10	0	10
Bowdoin A	Diamond Brandeis	0	10	10	20
Harvard A	Tufts B	10	10	10	30
MIT A	Brandeises Brew	10	10	0	20
Yale A	Northeastern A	10	10	0	20