Nuclei questions
336 published questions with worked solutions.
- Half life of radio-active element is 1600 years. The fraction of sample remains undecayed after 6400 years will be
- A radioactive substance has half-life of 60 minute. During 3 hour, the amount of substance decayed would be
- The half-life of the isotope _ 11 Na^ 24 is 15 hr. How much time does it take for ( 7 8 )^ th of a sample of this isotope to...
- Activity of a radioactive sample decreases to ( 1 4 )^ th of its original value in 4 days. Then in 16 days its activity will...
- Two radioactive materials A and B having decay constant '7 ' and ' ' respectively, initially have same number of nuclei. The time...
- _ 88 Ra^ 226 is converted into _ 82 Pb^ 206 by emission of alpha ( ) and beta ( ) particles. The number of alpha and beta...
- A radio active element has rate of disintegration 8000 disintegrations per minute at a particular instant. After four minutes it...
- A sample originally contained 10^ 20 radioactive atoms, which emit α-particles. The ratio of α particles emitted in the third...
- The decay constants of a radioactive substance for α and β emission are _ and _ respectively. If the substance emits α and β...
- The counting rate observed from a radioactive source at t = 0 was 1600 counts s^ -1 , and t = 8 s, it was 100 counts s^ -1 . The...
- Assume that a neutron breaks into a proton and an electron. The energy released during this process is (Mass of neutron = 1.6725...
- When Uranium is bombarded with neutrons, it undergoes fission. The fission reaction can be written as : _ 92 U^ 235 + _0n^1 _ 56...
- The half-life of a radioactive element A is the same as the mean-life of another radioactive element B. Initially both substances...
- A piece of bone of an animal from a ruin is found to have ^ 14 C activity of 12 disintegrations per minute per gm of its carbon...
- A piece of wood from a recently cut tree shows 20 decays per minute. A wooden piece of the same size placed in a museum (obtained...
- A nuclear reactor starts producing a radioactive nuclide X from t=0, at a constant rate of per second. Each decay of X produces...
- Four statements are given (A is mass number): A. The volume of a nucleus is proportional to A^ 1/3 . B. The volume of a nucleus...
- An unknown nucleus has a nuclear density of 2.29 10^ 17 kg/m ^3 and mass of 19.926 10^ -27 kg . Its mass number A is...
- Consider the following nuclear reaction ^ 238 U ^ 234 Th + ^ 4 He Take masses of ^ 238 U, ^ 234 Th and ^ 4 He as 238.050 u,...
- Two deuterons undergo nuclear fusion to form a Helium nucleus. The energy released in this process is (given binding energy per...
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