In this scientist’s “picture,” operators, but not state vectors, are time-dependent. For 10 points each:
[10e] Name this physicist whose “uncertainty principle” describes simultaneous measurement of position and momentum.
ANSWER: Werner Heisenberg [or Werner Karl Heisenberg; accept Heisenberg picture Heisenberg uncertainty principle]
[10m] There exists an uncertainty principle for each pair of variables with this relationship, like position and momentum. Two variables with this relationship are dual under the Fourier transform.
ANSWER: conjugate variables [accept canonically conjugate variables; prompt on complementary variables]
[10h] In general, uncertainty principles bound the product of the standard deviations of two operators below by one-half the magnitude of this quantity for their commutator. This quantity for an Hermitian operator A is calculated by placing A between a bra and a ket.
ANSWER: expectation value [reject “expectation”]
<Benjamin Chapman, Science - Physics> ~21055~ <Editor: David Bass>