Few Questions to those who have military Knowledge?

Question

How powerful is the modern Hydrogen Bomb -
a) In terms of radius of destruction
b)if it is made 20 megaton how much square km of area can it destroy
Is the fallout of the explosion of a nuclear or Hydrogen Bomb dangerous environmentally for Other countries in Extreme sense, like if 10 of them are blown up succesively in 3-5 months time on a huge stretch of land(3000 Km spread out)then woud it affect other countries 1000s of miles away from it.
Can the Neutron Bomb be designed to kill all organisms in a radius of 10 km.
What are the Big Bombs currently being developed , designed or researched upon By the US which are more powerful than the H Bombs but not Environmentally destructive.

Answer 1

Any H-Bomb or even if it is 20 megaton depends on impact, the damage are as follows:
100 kilometers radius-wipe out
200 kilometers radius-partial damage/radiation

Answer 2

right this is a few thing which you would be able to bite on in the 1960's the two the U. S. and russia enable off 50+ megaton nukes the fallout became up international huge and lead directly to the above floor attempting out ban. some thing else to bite on is the EMP effects on our united states of america think of of each civilian laptop burned out. How could our united states of america function after that? The neutron bomb replaced into designed to kill organisms and go away the systems even however those systems would be contaminated and the electronics destroyed. to date as i know there are not any new huge bombs in progression different than in step with risk to lighten and cut back the present warhead length. to date as great nukes we reached the smart length of warheads long term in the past maximum now an afternoon are in the a hundred and fifty-250 kiloton variety because it is the main sensible length for a nuke without killing your self.

Answer 3

Uh...Why do you want to know?
you gonna blow us up?