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Definitions (148)
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real object
The point(s) from which light rays diverge as they enter a lens or mirror. See: virtual object.
Meaning awaits approval from a moderator |
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absolute uncertainty
The uncertainty in a measured quantity is due to inherent variations in the measurement process itself. For very small scale events there may be inherent quantum uncertainty due to Heisenberg's u [..]
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virtual object
The point(s) to which light rays converge as they enter a lens. The rays do not actually pass through each object point. [One and only one ray, the one which passes through the center of the lens, doe [..]
Meaning awaits approval from a moderator |
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misuse alert
A very common mistake found in textbooks is to speak of "flow of current". Current itself is a flow of charge; what, then, could "flow of current" mean? It is either redundant, mis [..]
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empirical law
A law strictly based on experimental data, describing the relations within that data. A law generally describes a very specific and limited phenomenon, and does not have the broader scope of a theory.
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misuse alert
Sometimes the word electricity is colloquially misused as if it named a physical quantity, such as "The capacitor stores electricity," or "Electricity in a resistor produces heat." [..]
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misuse alert
In elementary lab manuals one often sees: experimental error = [your value - book value] / book value. This should be called the experimental discrepancy. Calculating this does not substitute for the [..]
Meaning awaits approval from a moderator |
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misuse alert
One sometimes sees "A force arises because of inertia." This misleads one into supposing that the inertia is a cause of the force. It is not hard to discuss all of the physics of force, mass [..]
Meaning awaits approval from a moderator |
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misuse alert
Many books emphasize that the mole is "just a number," a measure of the number of particles in a collection. They say that one can have a mole of any kind of particles, baseballs, atoms, sta [..]
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misuse alert
Radioactivity is a process, not a thing, and not a substance. It is just as incorrect to say "U-235 emits radioactivity" as it is to say "current flows." A malfunctioning nuclear r [..]
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