Findings from observational field experiments
Accidental observations made during other experiments
Discovery of several erroneous propositions in accepted theories
Predictions based on theoretical work
19. It can be inferred from the passage that scientists are currently making efforts to observe which of the following events?
The decay of a vacuum in the presence of virtual particles
The decay of a vacuum next to a superheavy atomic nucleus
The creation of a superheavy atomic nucleus next to an intense electric field
The creation of a virtual electron and a virtual positron as a result of fluctuations of a vacuum
The creation of a charged vacuum in which only real electrons can be created in the vacuums region of space
20. Physicists recent investigations of the decay of the vacuum, as described in the passage, most closely resemble which of the following hypothetical events in other disciplines?
On the basis of data gathered in a carefully controlled laboratory experiment, a chemist predicts and then demonstrates the physical properties of a newly synthesized polymer.
On the basis of manipulations of macroeconomic theory, an economist predicts that, contrary to accepted economic theory, inflation and unemployment will both decline under conditions of rapid economic growth.
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