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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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starting with a sample of Pure \({ }^{66} \mathrm{cu},(7 / 8)\) of it decays into \(\mathrm{Zn}\), 15 minutes. The half life the sample is (A) \(5 \mathrm{~min}\) (B) \(7.5 \mathrm{~min}\) (C) \(10 \mathrm{~min}\) (D) \(15 \mathrm{~min}\)
which of the following isotopes normally fissionable (A) \({ }_{92} \mathrm{U}^{233}\) (B) \({ }_{92} \mathrm{U}^{238}\) (C) \({ }_{92} \mathrm{U}^{235}\) (D) \({ }_{93} \mathrm{~Np}^{239}\)
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) \(10^{-15} \mathrm{~cm}\)
The binding energy Per nucleon of \({ }_{8} \mathrm{O}^{16}\) is $7.97 \mathrm{MeV}\( and that of \)_{8} \mathrm{O}^{17}\( is \)7.75 \mathrm{MeV}$ The energy \((\mathrm{in}-\mathrm{MeV})\) required to remove a neutron from $_{8} \mathrm{O}^{17}$ is (A) \(3.65\) (B) \(7.86\) (C) \(3.52\) (D) \(4.23\)
If the binding energy of electron in a hydrogen atom is \(13.6 \mathrm{eV}\), the energy required to remove the electron form the first state of \(\mathrm{Li}^{2+}\) is. (A) \(13.6 \mathrm{eV}\) (B) \(30.6 \mathrm{eV}\) (C) \(122.4 \mathrm{eV}\) (D) \(3.4 \mathrm{eV}\)
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