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19h
comment Can velocity be an undefined quantity?
$0/0$ can be defined as the limit of $\Delta y / \Delta x$ as $\Delta y, \Delta x \rightarrow 0$ if this limit exists, so is not (necessarily) undefined
1d
comment If we rub glass particles with paper , will there be any charge induction in glass particles?
Thats right, the further apart the two materials are on the series, the more charge will be transferred.
1d
answered If we rub glass particles with paper , will there be any charge induction in glass particles?
1d
comment How much pressure would be needed to contain a 1 gigaton nuclear bomb explosion within a sphere of one meter radius?
Given that 1kg of uranium 235 completely fissioned is equivalent to 17,500kg of TNT explosive, to produce a '1 megaton' explosion (equivalent to 1 billion tons TNT) you will need approximately 57,143kg of uranium, which at 18,000kg/m^3 would need at least 3m^3 so would take up 3/4 of the volume inside a sphere of 1m radius.
2d
answered Why do physics students find vectors so difficult to deal with?
Dec
16
comment Radiance increase via two sources
@pentane In any case... not exactly the same question. OP has asked about 'radiance' which I've explained in terms of 'irradiance' and 'illuminance'.
Dec
16
comment Radiance increase via two sources
@pentane Well OP has accepted this answer, so perhaps you should remove your downvote which was made after the fact
Dec
16
comment Radiance increase via two sources
@pentane Oh really? Why not? Why do you suppose OP has accepted the answer?
Dec
16
comment Measuring audio signals with a digital volt-meter
What do you mean 'measuring audio signals'? Do you mean power? Maximum amplitude? Frequency? A digital voltmeter may be useful in reading these simple parameters.
Dec
16
revised Radiance increase via two sources
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Dec
16
comment Radiance increase via two sources
Although 'radiance' is a general term for 'intensity of electromagnetic radiation' (measured in $W/m^2$), when talking about "visible light", the terms 'irradiance' (mesured in $W/m^2$) or 'illuminance'(measured in "lumens per $m^2$" commonly called "lux") are used. To answer your question in brief, yes two sources of light illuminating the same area will increase the 'illuminance'.
Dec
16
comment Radiance increase via two sources
Its not 'radiance' but "illuminance" which is the total luminous flux over a given area (measured in "lumens per $m^2$" which is called "lux", $lx$).
Dec
16
revised Radiance increase via two sources
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Dec
16
revised Radiance increase via two sources
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Dec
16
revised Radiance increase via two sources
added 199 characters in body
Dec
16
comment Radiance increase via two sources
So for 'white light', which consists of electromagnetic radiation across the visible light spectrum, we must use a 'weighted-sum' of frequencies, as defined in various 'luminosity' standards in photometry. These basically aim to specify a 'predictable' response for the human eye. See further edits (last 2 paragraphs) in my answer.
Dec
16
revised Radiance increase via two sources
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Dec
16
comment Radiance increase via two sources
See edits (last paragraph) in my answer.
Dec
16
revised Radiance increase via two sources
added 181 characters in body
Dec
16
revised Radiance increase via two sources
added 181 characters in body