scattering - 2023 BHSU @ Maryland

Question

Quantum mechanical techniques for describing this process include the Born approximation and partial wave analysis. For 10 points each:

[10e] Name this process, in which a wave or particle interacts with an object and is forced to deviate from a straight trajectory.

ANSWER: scattering

[10m] In partial wave analysis, a wave is broken down into components with specific values of this quantity, and the scattering for each component is computed independently. The commutator of this quantity's x and y components equals i times h-bar times this quantity's z-component.

ANSWER: angular momentum [accept L, reject “momentum”]

[10h] The optical theorem states that the total cross-section of a scatterer equals 4 pi over the wavevector, all times this expression, evaluated at an angle of zero.

ANSWER: imaginary part of the forward scattering amplitude [or Im[f(0)] (“imaginary part of f of zero”); accept answers that additionally specify “zero-angle” or that the argument of the scattering amplitude is zero; prompt on answers like “the imaginary part of the amplitude”; reject answers that do not specify the imaginary part]

<BB>

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Summary


2023 BHSU @ Sheffield	04/15/2023	Y	2	10.00	50%	50%	0%
2023 BHSU @ Waterloo	04/15/2023	Y	3	23.33	100%	100%	33%
2023 BHSU @ Yale	04/08/2023	Y	3	16.67	100%	67%	0%
2023 ARCADIA at Duke	Emory, Duke, Yale	N	3	13.33	100%	0%	33%
2023 ARCADIA at Emory	Emory, Duke, Yale	N	4	10.00	100%	0%	0%
2023 ARCADIA at Imperial	Imperial	N	5	14.00	100%	0%	40%
2023 ARCADIA at Maryland	Maryland, Online	N	3	10.00	67%	0%	33%
2023 ARCADIA at Ohio State	Ohio State, Texas	N	3	13.33	100%	33%	0%
2023 ARCADIA Online	Maryland, Online	N	2	10.00	100%	0%	0%
2023 ARCADIA at Texas	Ohio State, Texas	N	3	10.00	100%	0%	0%

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