Suppose that at time t = 0 an electron in a magnetic field in the +z direction has state 
. Let 
The expectation value 
as a function of time in this case is which of the below?
A. 
B. 
C. 0
D. 
E. 
F. Something else (specify)
D.
Physics & Space Science
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A wire contains a steady current of 2 A. The charge that passes a cross section in 2 s is:
A) 3.2 × 10-19 C B) 6.4 × 10-19 C C) 1 C D) 2 C E) 4 C
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A magnifying glass has a convex lens of focal length 15 cm. At what distance from a postage stamp should you hold this lens to get a magnification of +2.0?
What will be an ideal response?
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If a spring-operated gun can shoot a pellet to a height of 100. m on Earth, how high could the pellet rise if fired on the moon?
A) 3600. m B) 16.7 m C) 600. m D) 3.60 km E) 100. m
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Supernovas are thought to always result in
A) neutron stars. B) red giant stars. C) regular stars like our Sun. D) white dwarfs. E) black dwarfs.
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