The unit-conversion tag has no wiki summary.
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Unit conversion help (school)
Can someone please help me explaining how to convert units in problems like the one below? I've done many things, but I am very unsure of all my methods. Could you tell me what steps should I take?
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Photometer: measured Irradiance L converted to photon rate
I am conducting an experiment in which the power meter reading of $410\,nm$ narrow bandpass stimulus is noted to be 30 $\frac{\mu W}{cm^2}$ at a distance of 1 inch away from the light source.
I wish ...
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Coulomb's Law: why is $k = \dfrac{1}{4\pi\epsilon_0}$
This was supposed to be a long question but something went wrong and everything I typed was lost. Here goes.
Why is $k = \dfrac{1}{4\pi\epsilon_0}$ in Coulomb's law?
Is this an experimental fact?
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1answer
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CGS Units for Magnetism
Why does the formula for magnetic field force include the speed of light in the denominator in cgs units? Where does the extra $c$ go in SI units?
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Does the expression of the orbital magnetic dipole moment have $c$?
The orbital magnetic dipole moment of a particle with mass $m$ and charge $q$ can be shown to be related to the orbital angular momentum through the equation
$$\displaystyle ...
