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I live in the capital, 10 km from its center on the 9th floor, my windows facing the opposite direction will I still see a flash? Will I hear something? How loud will it be? How fast would I die? If I survive the blast what should do? Should I go underground or climb higher?

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closed as off topic by Waffle's Crazy Peanut, akhmeteli, joshphysics, David Z May 29 '13 at 5:51

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Wikipedia – Keep these mind May 28 '13 at 18:25
I think somebody survived Hiroshima's explosion, 300m from its center. – Ali May 28 '13 at 18:53
It's high time to stop worrying and love the Bomb! You implicitly assume that only the center of your city would be targeted; this may not be the case. Would suggest reading Glasstone, Dolan, the Effects of Nuclear Weapons for much more grisly (but still usable) information than can fit into the remaining 245 characters... – Deer Hunter May 28 '13 at 21:17
up vote 3 down vote accepted

Gugg's article is far enough as it covers everything you require. Firstly, It depends on the bomb. In other words, it's based on how bad the bomb is.

This Wiki article quotes it...

The amount of energy released by fission bombs can range from the equivalent of just under a ton of TNT, to upwards of 500,000 tons of TNT.

If that bomb is similar to Hiroshima's (equivalent to 20k tons of TNT), then here's how the effect of the bomb would be. 10 km would be "out" of this scale and hence, you'd experience nothing...

My windows facing the opposite direction, will I still see a flash?

I think you didn't correctly define this. At its present form, this is somewhat ridiculous to ask. But, from your region - it's quite a fireworks to see...

Will I hear something? How loud will it be?

No. All those pressure waves would lose energy and probably diminish off before reaching you. I think there won't be any harmful effects like doors & windows "banging". etc...

How fast would I die? If I survive the blast what should do? Should I go underground or climb higher?

Why should you do something when nothing happens to you? You wouldn't die..! Better take a vacation and stay off from the region.

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Of course, this answer assumes the bomb would be like Hiroshima's, which might easily not be the case… – o0'. Aug 11 '15 at 7:59

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