In the electron double-slit experiment with electrons, what happens when a detector is used to determine through which slit the electron actually passes?
A) The electron then acquires both a precise velocity and a precise position.
B) The pattern on the screen suddenly becomes an wave-interference pattern.
C) The electron suddenly jumps into a state of higher energy.
D) The pattern on the screen suddenly becomes a non-interference pattern.
E) Batman arrives.
Question 2
How did Brahe measure highly accurate planetary positions?
A) By careful measurements of the brightness of the planets, as seen from Earth.
B) With larger and more elegant sighting instruments.
C) By his invention of the technique know as triangulation (measuring the distance between 2 points, and measuring 2 angles, to determine the distance to a 3rd point).
D) With the recently-invented telescope.
E) With a new type of telescope that used mirrors instead of lenses.
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