The moderator in a reactor
Options
(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?
Options
(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:
Options
(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
Options
(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
Options
(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
Options
If λ₁ and λ₂ are the wavelengths of the first members of the Lyman and Paschen series respectively, then the λ₁ : λ₂ is
Options
(a) (1:3) (b) (1:30) (c) (7:50) (d) (7:108)
Two nuclei have their mass numbers into the ratio of 1:3. The ratio of their nucleus densities would be
Options
(a) 1 : 3 (b) 3 : 1 (c) (3)¹/³ : 1 (d) […]
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