What was Erwin Schroedinger's main contribution to the development of quantum theory?
A) He explained the photoelectric effect, in terms of photons.
B) He found a way to predict the overall statistical patterns that appear in the double-slit experiment with electrons and other experiments.
C) He discovered the uncertainty principle.
D) He found a way to predict the precises position at which electrons or other particles will strike the viewing screen in such experiments as the electron double-slit experiment.
E) He discovered the nonlocality principle.
B
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Imagine that you are sitting in a closed room (no windows, no doors) when, magically, it is lifted from Earth and sent accelerating through space with an acceleration of 1g (9.8 m/s2)
According to Einstein's equivalence principle, which of the following is true? A) You won't feel any change and will have no way to know that you've left Earth. B) You'll feel a force that will cause your head to repeatedly bang into the ceiling. C) You'll know that you left Earth because when you drop a ball it will fall sideways. D) You'll know that you left Earth because you'll be floating weightlessly in your room.
An irreversible engine operating between the temperatures of 550 K and 300 K extracts 1200 J of heat from the hot reservoir and produces 450 J of work. How much entropy is created in the process?
A) 0.32 J/K B) 0.68 J/K C) 0.44 J/K D) 0.73 J/K E) 0 J/K
In typical globular clusters, the brightest stars are ________
Fill in the blank(s) with correct word
Three coplanar parallel straight wires carry equal currents I to the right as shown below. Each pair of wires is a distance a apart. The direction of the magnetic force on the middle wire
a.
is up out of the plane of the wires.
b.
is down into the plane of the wires.
c.
is in the plane of the wires, directed upwards.
d.
is in the plane of the wires, directed downwards
e.
cannot be defined, because there is no magnetic force on the middle wire.