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What is the difference between federal purchases and federal expenditures?
Signal-detection Theory
A theory in psychology and cognitive science that explains how decision makers discern between important stimuli and background noise under conditions of uncertainty.
Psychophysics
The branch of psychology that studies the relationships between physical stimuli and the sensations and perceptions they produce.
Electromagnetic Energy
The energy propagated through space or matter as electromagnetic waves or photons, involved in phenomena such as light, radio waves, and X-rays.
Mechanical Energy
The sum of potential and kinetic energy in a physical system, which enables it to do work.
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