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What effect would the bomb have?

Big crater
World annihilation
Everyone is dead

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Author Topic: Effects of an antimatter bomb? VOTE!  (Read 14303 times)

halberdear

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Effects of an antimatter bomb? VOTE!
« on: May 12, 2011, 03:00:10 pm »

I'm making a short story for school, and the main conflict has to do with an antimatter bomb. I've searched all over the place for damage converters, but most are for conventional nuclear bombs, not antimatter bombs.



The bomb contains 250 pounds of Anti-uranium. Any idea what kind of effect this would have if it was detonated in the Baltic Sea area?



« Last Edit: May 12, 2011, 04:03:33 pm by halberdear »
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Darvi

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Re: Effects of an antimatter bomb?
« Reply #1 on: May 12, 2011, 03:01:07 pm »

Afaik anti uranium doesn't exist yet.

But it'd be a pretty bright and devastating flash.
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Taricus

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Re: Effects of an antimatter bomb?
« Reply #2 on: May 12, 2011, 03:05:58 pm »

And one VERY big crater...
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Leafsnail

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Re: Effects of an antimatter bomb?
« Reply #3 on: May 12, 2011, 03:09:36 pm »

Why would it need to be uranium?  I think just having 72x as much anti hydrogen would have a similar effect and be much easier to use... unless you're making an antimatter fission bomb, in which case it could be a crazy clusterbomb (antimatter explodes, is sent flying everywhere, hits matter and is then converted into energy for more explosions).  And that'd be before you even got started on the anti-nuclear fallout...
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Criptfeind

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Re: Effects of an antimatter bomb?
« Reply #4 on: May 12, 2011, 03:14:12 pm »

I believe the energy per unit mass that Antimatter gives off is four orders of magnitude (10000 times) more power then nuclear fission. So a bomb with 2500000 pounds of nuclear payload would do about the same. Stick that in one of them damage converters I guess.
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Silfurdreki

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Re: Effects of an antimatter bomb?
« Reply #5 on: May 12, 2011, 03:18:01 pm »

A big crater would be an understatement to say the least...

What you're looking at is completely converting 227 kg (500 pounds, antimatter + same amount of normal matter) into energy via annihilation. Use Einstein's famous equation: E=mc2, m=227 kg. This gives E roughly equal to 2·1019 J. That's almost half the energy output of a supernova (1046 J). I'd say that would pretty certainly be a literal earth-shattering kaboom.
« Last Edit: May 12, 2011, 03:20:54 pm by Silfurdreki »
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halberdear

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Re: Effects of an antimatter bomb?
« Reply #6 on: May 12, 2011, 03:21:43 pm »

Why would it need to be uranium?  I think just having 72x as much anti hydrogen would have a similar effect and be much easier to use...

Well Anti-uranium is denser and therefor can be contained in a smaller package. Plus, anti-uranium sounds cool.
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halberdear

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Re: Effects of an antimatter bomb?
« Reply #7 on: May 12, 2011, 03:22:06 pm »

A big crater would be an understatement to say the least...

What you're looking at is completely converting 227 kg (500 pounds, antimatter + same amount of normal matter) into energy via annihilation. Use Einstein's famous equation: E=mc2, m=227 kg. This gives E roughly equal to 2·1019 J. That's almost half the energy output of a supernova (1046 J). I'd say that would pretty certainly be a literal earth-shattering kaboom.

Whoa.
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Darvi

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Re: Effects of an antimatter bomb?
« Reply #8 on: May 12, 2011, 03:23:08 pm »

Almost half? Somebody doesn't know his exponentials it seems.
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Simmura McCrea

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Re: Effects of an antimatter bomb?
« Reply #9 on: May 12, 2011, 03:24:52 pm »

Regardless of your grasp of indices, I think we can agree that it'd be one hell of a crater. Detonated in the Baltic Sea, I think we can kiss a good chunk of Scandinavia goodbye.
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Darvi

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Re: Effects of an antimatter bomb?
« Reply #10 on: May 12, 2011, 03:25:28 pm »

That we can agree on.
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Silfurdreki

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Re: Effects of an antimatter bomb?
« Reply #11 on: May 12, 2011, 03:25:40 pm »

Almost half? Somebody doesn't know his exponentials it seems.

Oh...

 :-[

I'm now a very embarrassed Astrophysics student...
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alway

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Re: Effects of an antimatter bomb?
« Reply #12 on: May 12, 2011, 03:27:01 pm »

About 1 * 10^19 Joule explosion, according to E=mc^2. Since in antimatter reactions (unlike standard nuclear bombs) 100% of the fuel is converted into energy (compared to up to something like 7% of the best of thermonuclear bombs and under 1% for fission bombs). About 50% is lost to neutrinos, but this is made up for by the fact that 100% of the energy is released both from the antimatter and the matter it explodes with, thus the usable explosive energy is about 100% of the E=mc^2 of the antimatter mass (1 * 2 * .5 = 1).

As for the particular type of antimatter, it actually doesn't matter, as it is the mass, rather than what it is made of, which is important. You would actually probably not use uranium, so as to avoid your antimatter undergoing radioactive decay and/or fission (and thus reducing the amount of antimatter and strength of the reaction). Most likely it would be in the form of simple, stable anti-molecules like hydrogen or helium or even subatomic particles, depending on which was easier to contain in the given situation.

Based on wiki's figure of 4.18 * 10^15 joules per megaton of tnt, that's about 2400 megatons of tnt if my math is right; the Tsar Bomba, the largest nuclear weapon ever detonated, was 50 megatons. According to wikipedia, it would give you a 3rd degree burn from the heat from 100 km away. This antimatter weapon would be 48 times more powerful.

edit: corrected; my initial calculation was off by 2 magnitudes due to counting fail; 48 times more powerful than the Tsar Bomba is updated figure.

Based on the 100km 3rd degrees burn data about the Tsar Bomba's heat and assuming a dissipation something between squared and cubes, the 3rd degree burn radius would be somewhere between 700 and 360 km. The air blast would probably shatter every window worldwide, although the earthquake wouldn't do much, since the area it would actually have a decent effect on would be completely incinerated anyway. The mushroom cloud would probably eject a decent amount of dust and particulate matter into orbit, giving any spacecraft passing through the plume a nice sanding job.
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A shock wave was observed in the air at Dikson settlement 700 kilometres (430 mi) away; windowpanes were partially broken to distances of 900 kilometres (560 mi). Atmospheric focusing caused blast damage at even greater distances, breaking windows in Norway and Finland. The seismic shock created by the detonation was measurable even on its third passage around the Earth.[7] Its seismic body wave magnitude was about 5 to 5.25.[6] The energy yield was around 7.1 on the Richter scale but, since the bomb was detonated in air rather than underground, most of the energy was not converted to seismic waves. The TNT equivalent of the 50 MT test could be represented by a cube of TNT 312 metres on a side, approximately the height of the Eiffel Tower.
« Last Edit: May 12, 2011, 03:48:03 pm by alway »
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Ultimuh

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Re: Effects of an antimatter bomb?
« Reply #13 on: May 12, 2011, 03:28:39 pm »

And if that weren't enough, think of the earthquakes everyone else will be having.
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Darvi

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Re: Effects of an antimatter bomb?
« Reply #14 on: May 12, 2011, 03:30:30 pm »

[snip]
And now I want one of those :O
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