Roberto Pavani's latest activity
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Roberto Pavani reacted to some bloke's post in the thread High School Tennis Balls in the Ocean with
Like.
Hello all, I indulged myself a curiosity today on the question of how much the sea levels would rise if we covered them with tennis... -
Roberto Pavani replied to the thread High School Tennis Balls in the Ocean.A slightly simpler way to see it: since Archimedes guarantees each ball displaces exactly ##m/\rho## of water regardless of geometry...
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Roberto Pavani replied to the thread High School Tennis Balls in the Ocean.My previous answer may have been too short. The coastline effect gives a correction that scales with coastline length (L), whereas the...
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Roberto Pavani reacted to PeterDonis's post in the thread Undergrad Question about increasing laser power with Like.
The OP question has been sufficiently addressed. Thread closed. Thanks to all who participated.
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Roberto Pavani replied to the thread Graduate A rotating frame equation for the "carousel experiment".Foucault is the answer / corollary
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Roberto Pavani reacted to Dale's post in the thread Graduate A rotating frame equation for the "carousel experiment" with Like.
What is the carousel experiment?
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Roberto Pavani replied to the thread High School Tennis Balls in the Ocean.border effects goes like L, area goes as L^2 so the inperfect packing error is negligible on ocean scale
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Roberto Pavani replied to the thread High School Tennis Balls in the Ocean.That would be a nice GDP boost
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Roberto Pavani replied to the thread High School Tennis Balls in the Ocean.An equivalent way to see it: the sea level rise is the same as the water rise you'd observe when placing one tennis ball in a...
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Roberto Pavani reacted to tech99's post in the thread Undergrad The effect of a radio wave on an electron with Like.
Yes I agree with that but the initial question seems to be about just the effect of an EM wave on an electron in a plasma and does not...
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Roberto Pavani replied to the thread Undergrad The effect of a radio wave on an electron.Not an expert in RF plasma propagation, but the ionosphere reflects most HF (3–30 MHz), and the electron gyrofrequency f_H ≈ 1.4 MHz...
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Roberto Pavani replied to the thread Undergrad Bell's theorem and measurements not done.A side note: Fine (Phys. Rev. Lett. 48, 291, 1982) shows that the Bell inequalities hold if and only if a joint distribution for all...
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Roberto Pavani reacted to berkeman's post in the thread Undergrad Question about increasing laser power with
Haha.
1.21 ggigawatts. -
Roberto Pavani replied to the thread Undergrad Question about increasing laser power.What you're describing is essentially a passive Fabry-Pérot cavity. This is actually a well-known setup — the intracavity field can be...
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Roberto Pavani replied to the thread Undergrad Question about increasing laser power.The answers above are correct. Just adding a safety note: any laser above ~500 mW (Class 4) requires proper eye protection, not just...