PeroK's latest activity
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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... -
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...
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##\cos (110^{\circ})## is negative so you can tell that ##1 - \cos (110^{\circ})## will be greater than 1. (I haven't checked if that...
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PeroK replied to the thread Compton shift problem.I get 17.8%. Note that energy is inversely proportional to wavelength.
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PeroK replied to the thread Compton shift problem.It's better to use algebra and plug the numbers in at the end. You should be able to express the percentage energy loss as a function of...
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PeroK reacted to ShadowKraz's post in the thread B Is space stretching or is new space being created? with Like.
Been there, read that, moved beyond. It does help folks mired in the balloon analogy, however, I'm not mired in it. But thank you.
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PeroK replied to the thread Help me to clear my doubt about a problem of Classical Mechanics (Car and Bicycle).PS it's actually a Spline function - continuous and piecewise polynomial in ##t##.