PeroK's latest activity
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My article cites the exact wording (Latin) and its English translation: “Cubum autem in duos cubos, aut quadratoquadratum in duos... -
"I have discovered a truly marvelous proof of this, which this margin is too small to contain."
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PeroK replied to the thread Errors and significant figures.As I said, my instinct is that the true area must lie within the given range. In this case, area could be 20.8, which is not ## 19\pm...
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PeroK replied to the thread Errors and significant figures.It's not a question of being precise. It's a question of the area definitely lying within the range given.
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PeroK replied to the thread Errors and significant figures.PS 20.5 is not an upper limit for the area. It would have to be ##19 \pm 2##, assuming the error must be symmetric.
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PeroK replied to the thread Errors and significant figures.My mathematical instinct is satisfied by ##19.4 \pm 1.5##. In this case, reducing the answer to ##19## plus or minus whatever doesn't...
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PeroK replied to the thread Errors and significant figures.I'm not sure I know the expected answer, but I'd make the following observation. With that data, the area is between 17.92 and 20.88...
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I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2...
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Hello everyone, I'm Cosmo. I'm an 18 years old student majoring in physics. I found this forum cause I was searching on Google if it's...
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PeroK replied to the thread I Electron energy in atoms.The expected value is the average. You always get an energy corresponding to the transition between two eigenstates. The measurement of...
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PeroK replied to the thread I Electron energy in atoms.Only the ground state is stable. An atom in an excited state will emit one or more photons and reduce to the ground state. The same...
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PeroK reacted to kuruman's post in the thread Can terminal velocity be determined from the information given? with
Like.
Where did the maximum speed of 150 mph in your solution come from? On edit After some snooping, I found that solutions of this problem... -
PeroK replied to the thread AI Marketed To Students: "Hello easy A's!".She and her husband are not short of a bob or two!
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PeroK replied to the thread Compton shift problem.The energy of a photon is inversely proportional to the wavelength. Hence $$\frac{E'-E}{E} = \frac{E'}{E}-1 = \frac{\lambda}{\lambda'}...
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PeroK reacted to FactChecker's post in the thread Finding the nth roots of a complex number with Like.
By the time one takes complex analysis, he should be comfortable leaving it as ##\sqrt 2##. Leave the approximation accuracy for the...
