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Is uranium an element or a compound or heterogeneous mixture or a homogeneous mixture?
Uranium ore is a heterogeneous mixture
Radioactive element used for nuclear energy?
Uranium is the most commonly used radioactive element for nuclear energy production. When uranium atoms undergo nuclear fission, they release energy that can be harnessed in nuclear reactors to generate electricity.
How was nuclear energy used in World War 2?
Nuclear energy was used in World War II to detonate two nuclear warheads over Hiroshima, Japan, on August 6, 1945, and over Nagasaki, on August 9, 1945.The Hiroshima weapon was comprised of two subcritical mases of 235U92, that were driven into each other by conventional explosives, going super prompt critical and exploding.The Nagasaki weapon was comprised of a sphere of 239Pu94 surrounding a polonium/beryllium neutron initiator, all surrounded by shaped charges of convertional explosives. The same mechanism applies on detonation.Some sources state a different configuration, in that the Hiroshima weapon was actually 239Pu94 , while the Nagasaki weapon was actually 235U92, surrounded by layers of Beryllium. The opposite seems more correct, from a physics standpoint, so this is either a misunderstanding by this auther, a mistatement by some older documents, or by mis-information. Any one with better knowledge is, of course, welcom to refine this answer.
The half life of uranium 235 is 700 million years After 1.4 billion or 1 400 million years what fraction of the original amount of uranium 235 remains?
A half life pertains to the time it takes for exactly half of a substance to disappear. So, if U235 has a half life of 700 million years, it will take 700 million years for half of it to decay. That would leave .5kg or 500g.
