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location London, United Kingdom
age 29
visits member for 3 years, 9 months
seen Sep 4 at 18:03

Phd student


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Feb
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comment Cosmic radiation cutoff at LOW energies?
Below 1GeV particles aren't generally considered relativistic and therefore, when they bombard our atmosphere from outer-space, they're just not normally refered to as cosmic rays. Furthmore, sub-GeV particles would very quickly thermalise in our atmosphere (Ie exhibit Brownian motion) and therefore retain no information about from where they came.
Feb
23
comment Cosmic radiation cutoff at LOW energies?
From where did you here there was a low energy cut-off? Technically, there isn't. Stable particles (alphas, protons, neutrinos etc) can have arbitarily low energies. Of course there comes a point when either; we would tend not to refer to them as cosmic rays (most would be solar wind for example), or when detector technolgy prevents us from seeing them. However, these don't really constitute as a 'cut-off' in the traditional sense of the word.
Feb
22
comment Cerenkov light - a practical calculation
@zephyr, could you perhaps type up your calculation into an answer? Allbeit approximate, I think it will be sufficient for my purposes and will therefore duly accept it.
Feb
20
comment Cerenkov light - a practical calculation
Isn't it okay to assume that the muon would be travelling at $c$ throughout it's passage through the glass? It is only 10cm afterall. For a $5keV$ muon: $1-v/c=2.4\times10^{-5}$. Either way, my attempt at the calculation gave $4\times10^{-47}J$ which I really don't think is correct. Basically I'm still stuck :(
Feb
20
comment Cerenkov light - a practical calculation
Hi zephr. Of course your right if the integral were carried out over the full range of frequencies. In practice however, I'll be using something like this[1] to detect ring patterns and it is sensitive only to wavelengths in the range 300-650nm. [1]: sales.hamamatsu.com/index.php?id=13199716&language=2&;
Feb
20
asked Cerenkov light - a practical calculation
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31
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Oct
11
revised Very basic question: When to use $s=vt$, $s=1/2vt$, $s=at$ and $s=a/t^2$?
Created new tag