The half life of a radioactive isotope ‘X’ is 20 years. It decays to another element ‘Y’ which is stable. The two elements ‘X’ and ‘Y’ were found to be in the ratio of 1 […]
Two nuclei are said to be mirror nuclei of
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(a) number of protons in the two nuclei are equal (b) number of neutrons in the two are equal (c) number of neutrons […]
The moderator in a reactor
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(a) absorbs neutrons (b) accelerates neutrons (c) slows down neutrons (d) absorbs thermal energy produced in the reactor
Correct Answer:
slows down neutrons
Explanation:
No explanation available. […]
In nuclear fusion, two nuclei come together to form a large nucleus. Which of the following is a correct equation for such a reaction?
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(a) ₉₈Cf²⁵³→₉₉Th²⁵³+₋₁e⁰ (b) ₄Be⁹→₂He⁴+2He⁴+₀n¹ (c) ₁H²+₁H³→₂He⁴+₀n¹+₁e⁰ (d) ₉₂U²³⁸+₀n¹→₉₂U²³⁹
If the number of radius of ²⁷Al is 3.6 Fermi, the approximate nuclear radius of ⁶⁴Cu in Fermi is:
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(a) 2.4 (b) 1.2 (c) 4.8 (d) 3.6
Correct Answer:
4.8
Explanation:
The […]
Fusion reaction takes place at high temperature because
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(a) nuclei break up at high temperature (b) atoms get ionised at high temperature (c) kinetic energy is high enough to overcome the coulomb […]
The power obtained in a reactor using U²³⁵ disintegration is 1000 kW. The mass decay of U²³⁵ per hour is
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(a) 10 microgram (b) 20 microgram (c) 40 microgram (d) 1 microgram
The decay constant of a radio isotope is λ. If A₁ and A₂ are its activities at time t₁ and t₂ respectively, the number of nuclei which have decayed during the time (t₁ – t₂): […]
The binding energy per nucleon in deuterium and helium nuclei are 1.1 MeV and 7.0 MeV, respectively. When two deuterium nuclei fuse to form a helium nucleus the energy released in the fusion is:
The mass of a ⁷₃ Li nucleus is 0.042 u less than the sum of the masses of all its nucleons. The binding energy per nucleon of ⁷₃ Li nucleus is nearly
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