Nuclei questions
336 published questions with worked solutions.
- The decay constant of a radio isotope is . If A_1 and A_2 are its activities at times t_1 and t_2 respectively, the number of...
- A radio isotope X with a half life 1.4 10^ 9 years decays of Y which is stable. A sample of the rock from a cave was found to...
- Age of a tree is determined by using radio-isotope of [EAMCET (Engg.) 1995]
- The half-life of a radioactive element which has only 1 32 of its original mass left after a lapse of 60 days is
- A radioactive element _ 90 X ^ 238 decays into _ 83 Y ^ 222 . The number of - particles emitted are
- A radioactive decay can form an isotope of the original nucleus with the emission of particles [K CET 2015]
- A sample contains 16 g of a radioactive material, the half-life of which is two days. After 32 days, the amount of radioactive...
- Unit of radioactivity is Rutherford. Its value is [MP PMT 1994]
- A sample of radioactive element has a mass of 10 g at an instant t=0. The approximate mass of this element in the sample after...
- For the radioactive nuclei that undergo either or decay, which one of the following cannot occur? [WB-JEE 2014]
- The half life of a radioactive isotope 'X' is 20 years. It decays to another element 'Y' which is stable. The two elements 'X'...
- The half life of a radioactive substance is 20 days. If 23 part of the substance has decayed in time t_2 and 13 part of it has...
- A radioactive nucleus (initial mass number A and atomic number Z) emits 3 -particles and 2 positrons. The ratio of number of...
- If the energy released in the fission of one nucleus is 200 MeV. Then the number of nuclei required per second in a power plant...
- A radioactive material decays by simultaneous emission of two particles with respective half lives 1620 and 810 years. The time...
- Half-life of a radioactive substance is 20 minutes. Difference between points of time when it is 33% disintegrated and 67%...
- If a proton and anti-proton come close to each other and annihilate, how much energy will be released? [DCE 1999, DCE 2003]
- A mixture consists of two radioactive materials A_1 and A_2 with half lives of 20 s and 10 s respectively. Initially, the mixture...
- If 20 g of a radioactive substance due to radioactive decay reduces to 10 g in 4 minutes, then in what time 80 g of the same...
- Half-life of radioactive sample, when activity of material initially was 8 counts and after 3 hours it becomes 1 count is
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