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Chapter 18: Problem 2530
Plutonium decays with half life time 24000 yrs. if Plutonium is stored after 72000 yrs, the fraction of it that remain (A) \((1 / 2)\) (B) \((1 / 9)\) (C) \((1 / 12)\) (D) \((1 / 8)\)
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An \(\alpha\) -particle of energy \(5 \mathrm{MeV}\) is scattered though \(180^{\circ}\) by a fixed uranium nucleus. The distance of the closet approach is of the order of (A) \(10^{-8} \mathrm{~cm}\) (B) \(10^{-12} \mathrm{~cm}\) (C) \(10^{-10} \mathrm{~cm}\) (D) \(10^{-15} \mathrm{~cm}\)
In the nuclear reaction \(\mathrm{X}(\eta, \alpha)_{3}^{7}\) Li the atom \(\mathrm{X}\) will be (A) \({ }_{2} \mathrm{He}^{4}\) (B) \(_{5} \mathrm{~B}^{11}\) (C) \(_{5} \mathrm{~B}^{10}\) (D) \({ }_{5} \mathrm{~B}^{9}\)
Radio carbon dating is done by estimating in the specimen (A) the amount of ordinary carbon still present (B) the ratio of the amounts of \({ }^{14}{ }_{6} \mathrm{C}\) to ${ }_{6} \mathrm{C}^{12}$ (C) the amount of radio carbon still Present (D) None of these
which of the following cannot be emitted in radioactive decay of the substance? (A) Helium-nucleus (B) Electrons (C) Neutrinos (D) Proton.
The energy released by the fission of one uranium atom is \(200 \mathrm{MeV}\). The number of fission Per second required to Produce \(3.2 \mathrm{w}\) of Power is (A) \(10^{10}\) (B) \(10^{7}\) (C) \(10^{12}\) (D) \(10^{11}\)
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