By the succesive disintegration of ₉₂U²³⁸, the final product obtained is ₈₂Pb²⁰⁶, then how many number of α and β-particles are emitted?
Options
(a) 6 and 8 (b) 8 and 6 (c) 12 and […]
During negative β-decay
Options
(a) Neutron converts into proton (b) Proton converts into neutron (c) Neutron proton ratio increases (d) None of these
Correct Answer:
Neutron converts into proton
Explanation:
No explanation available. […]
In atom bomb, the reaction which occurs is
Options
(a) fusion (b) controlled fission (c) uncontrolled fission (d) thermonuclear
Correct Answer:
uncontrolled fission
Explanation:
No explanation available. Be the first to write the […]
1 curie is equal to
Options
(a) 3×10¹⁰ disintegrations/sec (b) 3.7×10⁷ disintegrations/sec (c) 5×10⁷ disintegrations/sec (d) 3.7×10¹⁰ disintegrations/sec
Correct Answer:
3.7×10¹⁰ disintegrations/sec
Explanation:
No explanation available. Be the first to write the explanation […]
A nucleus ᵐₙ X emits one α- particle and two β- particles. The resulting nucleus is
Options
(a) ᵐ⁻⁶ₙ₋₄ Z (b) ᵐ⁻⁶ₙ Z (c) ᵐ⁻⁴ₙ X (d) ᵐ⁻⁴ₙ₋₂ Y
Correct Answer:
ᵐ⁻⁴ₙ X
If doubly ionised lithium atom is hydrogen like with atomic number 3, the wavelength of radiation required to excite the electron in Li⁺⁺ from the first to the third Bohr orbit and the number of […]
Activity of a radioactive sample decreases to (1/3)rd of its original value in 3 days. Then, in 9 days its activity will become
Options
(a) (1/27) of the original value (b) (1/9) of […]
An α-particle of energy 5 MeV is scattered through 180⁰ by a fixed uranium nucleus. The distance of the closest approach is of the order of
Options
(a) 1Å (b) 10⁻¹⁰ cm (c) […]
The half-life of radioactive element is 600 yr. The fraction of sample that would remain after 3000 yr is
Options
(a) (1/2) (b) (1/16) (c) (1/8) (d) (1/32)
Correct Answer:
(1/32)
Explanation:
No […]
The approxiamate ratio of nuclear mass densities of ₇₉Au¹⁹⁷ and ₄₇ Ag¹⁰⁷ nuclei is
Options
(a) (197:107) (b) (47:79) (c) (79:47) (d) (1:1)
Correct Answer:
(1:1)
Explanation:
No explanation available. Be the first […]
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