>>> Who invited the atomic bomb?The first atomic bombs were developed in the USA towards the end of World War 11 by a team of scientists under the leadership of Robert Oppenheimer (1904-1967).
>>>How can radioactivity be used to indicate age?
Radioactivity proceeds at a very steady rate. So, by measuring how much of a substance has decayed radioactivity, you can tell how old it is. With once- living things, the best radioactive isotope to measure is carbon-14. This form of dating is called carbon dating.
>>>What is an atomic bomb?
One of two main kinds of nuclear weapon is the A-bomb. It relies on the explosive nuclear fisssion of uranium-235 or plutonium 239.
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>>>What is half-life?
Ssientisits cannot predict when exactly an atomic nucleus will decay, But they can predict how long it will take for half the atom in a given quantity of a radioactive elemant to decay. This is its half-life, Strontium-90 has a half of 9 minutes. Uranium-238 has a half-life of 4.5 billion years.