₉₂U²³⁴ has 92 protons and 238 nucleons. It decays by emitting an alpha particle and becomes
Options
(a) ₉₂U²³⁴ (b) ₉₀Th²³⁴ (c) ₉₂U²³⁵ (d) ₉₃Np²³⁷
Correct Answer:
₉₀Th²³⁴
Explanation:
Emission of alpha particle, decreases […]
A mixture consists of two radioactive materials A₁ and A₂ with half lives of 20s and 10s respectively. Initially the mixture has 40 g of A₁ and 160 g of A₂. The amount of the […]
Consider two nuclei of the same radioactive nuclide. One of the nuclei was created in a supernova explosion 5 billion years ago. The other was created in a nuclear reactor 5 minutes ago. The probability […]
Curie is the unit of
Options
(a) half life period (b) decay constant (c) radioactivity (d) nuclear force
Correct Answer:
radioactivity
Explanation:
No explanation available. Be the first to write the explanation for […]
The half life of radioactive isotope ‘X’ is 50 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 : […]
A radioactive substance has a half-life of four months. Three-fourth of substance will decay in
Options
(a) 3 months (b) 4 months (c) 8 months (d) 12 months
Correct Answer:
8 months
Explanation:
Substance […]
Two radioactive materials X₁ and X₂ have decay constants 5λ and λ respectively. If initially they have the same number of nuclei, then the ratio of number of nuclei of X₁ to that of X₂ […]
In a radioactive decay process, the negatively charged emitted β- particles are
Options
(a) the electrons produced as a result of the decay of neutrons inside the nucleus (b) the electrons produced as […]
The nuclei of which one of the following pairs of nuclei are isotones?
Options
(a) ₃₄Se⁷⁴,₃₁Ga⁷¹ (b) ₃₈Sr⁸⁴,₃₈Sr⁸⁶ (c) ₄₂Mo⁹²,₄₀Zr⁹² (d) ₂₀Ca⁴⁰,₁₆S³²
Correct Answer:
₃₄Se⁷⁴,₃₁Ga⁷¹
Explanation:
Isotones means number of neutron remains same.
The half life of radium is about 1600 year. Of 100 gram of radium existing now, 25g will remain unchanged after
Options
(a) 4800 year (b) 6400 year (c) 2400 year (d) 3200 year
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