That depends on what you're referring to: The fireball radius (the nuclear explosion itself), the total anhiliation range radius, and etc.
For example, the bomb launched on Hiroshima had a fireball of several hundred feet in radius, a 1km total destruction range radius, and severe damage for miles.
For firepower bombs (nuclear bombs made for power show & not effectiveness)
The Tsar bomba of USSR had 50~55 megatons of TNT firepower, a fireball with 1km+ radius, total destruction for miles, and created a sound shockwave that could be heard in Norway/Other far Northern European areas.
Modern nuclear weapons don't have a single blast radius; the U.S. developed M.I.R.V.s (cluster nuclear bombs) that spread apart to create a shotgun blast of multiple nuclear explosions.
35km
The fireball was roughly 1500 feet in diameter (750 feet in radius).Blast damage was found at 10000 yards (30000 feet) to some of the bunkers.The blast was heard hundreds of miles away.
That is approximately proportional to the cubed root of its yield. This is also true of conventional bombs.
Mostly by blast as with any other explosive device. Also the heat and radiation contribute of course.
The effects of nuclear weapons break down into: 1- Thermal (heat damage) 2- Blast damage (shock wave) 3- Residual radiation & fall out.
35km
This really depends on a number of factors, such as the yield of the weapon, the detonation altitude, and the terrain.
Exactly the same thing as a TNT bomb of the same yield.
The fireball was roughly 1500 feet in diameter (750 feet in radius).Blast damage was found at 10000 yards (30000 feet) to some of the bunkers.The blast was heard hundreds of miles away.
The radius of the device, or of the effects? Both vary dramatically from weapon to weapon. Physically bombs have been built with external case radii from 3 inches or less to as much as 10 feet. As to effects the blast radius for devices that have been built varies from about 0.1 mile to over 60 miles. Other effects give different radii for the same device. It would be easier to give a useful answer if the question was clearer and more precise.
That is approximately proportional to the cubed root of its yield. This is also true of conventional bombs.
Heat is the obvious choice for controlled use of nuclear energy. In a weapon you also want a blast effect to destroy buildings etc.
No, a nuclear weapon needs a specific geometry to detonate, and it has to be held in this position by very high explosives to keep it in this shape. In a nuclear reactor, if the reactor core goes critical then the force of the expanding coolant will blow the reactor apart, preventing a nuclear blast.
Little Boy was the nuclear bomb detonated over Hiroshima. It used uranium and had an explosive blast equivalent to 12,500 tons of TNT. A 1 megaton hydrogen bomb, hypothetically detonated on the earth's surface, has about 80 times the blast power of that 1945 explosion. Considering the tonnage of a bomb to be contant, The blast radius varies dependent on whether it is a ground burst or an airburst. Further, the height of the airburst above ground affects the radius too. At a height of 1900 feet above ground, Little Boy produced a blast radius of 1 mile; an area of some 4.7 square miles.
The meaning of the word nuclear weapon, is a weapon that has a nuclear warhead on it.
Mostly by blast as with any other explosive device. Also the heat and radiation contribute of course.
If they are anywhere near the blast zone, you can count on people dying. Depending on the size of the weapon, there will be a radius of destruction, and anyone within it will die from the blast or its effects (flying debris, falling structures, or the like). Outside this is a zone where direct exposure to the blast will cause major burns on the body. Radiation will also be extreme. The physical burden of the two will kill in days or weeks. And on out further, we'll see an area where the radiation will be great enough to kill a decreasing percentage of those exposed as we move farther out from ground zero. The nuclear weapon is designed to blow up a lot of stuff. That's why it was built, and why it is effective. It works as advertised.