91影视

What celebrated equation shows the equivalence of mass and energy?

What becomes of the 鈥渓ost鈥� mass per nucleon in fission and fusion reactions?

Which isotope of hydrogen鈥攄euterium or tritium鈥攊s abundant and which is scarce?

What kind of nuclear power is responsible for sunshine?

The kiloton, which is used to measure the energy released in an atomic explosion, is equal to \(4.2 \times 10^{12} \mathrm{J}\) (approximately the energy released in the explosion of 1000 tons of TNT). Recalling that 1 kilocalorie of energy raises the temperature of 1 \(\mathrm{kg}\) of water by \(1^{\circ} \mathrm{C}\) and that 4184 joules is equal to 1 kilocalorie, show that the energy released by a 20 -kiloton bomb is enough to heat \(4.0 \times 10^{8}\) kilograms of water (nearly half a million tons) through \(50^{\circ} \mathrm{C} .\)

Do today鈥檚 nuclear power plants use fission, fusion, or both?

Why doesn鈥檛 uranium ore spontaneously undergo a chain reaction?

Some heavy nuclei, containing even more protons than the uranium nucleus, undergo 鈥渟pontaneous fission,鈥� splitting apart without absorbing a neutron. Why is spontaneous fission observed only in the heaviest nuclei?

Why will the escape of neutrons be proportionally less in a large piece of fissionable material than in a smaller piece?

Which shape is likely to need more material for a critical mass: a cube or a sphere? Explain.