4. A and B are two radioactive substance whose half lives are 1 and 2 years respectively. Initially 10g of A and 1g of B is taken. The time after which they will have same quantity remaining is :
(a) 3.6 years
(b) 7 years
(c) 6.6 years
(d) 5 years
| Subject Name : Physics |
| Exam Name : JEE, NEET, IIT GATE, IIT JAM, UGC NET, UPSC, SSC, KVS, NVS |
| Posts Name : Technical Assistant, Junior Scientist, Post Graduate Teacher, Lecturer |
| Physics Books |
Related Posts
Radioactivity » Exercise - 1 1. Plutonium decays with half life time 24000 years. If Plutonium is stored after 72000 years, the fraction of it that remain : (a) 1/2 (b) 1/4 (c) 1/8 (d) 1/12- Home » Physics » Radioactivity
- Radioactivity » Exercise - 15. What Percent of original radio active substance is left after 5 half life time : (a) 3% (b) 5% (c) 6% (d) 12%
- Radioactivity » Exercise - 12. A radioactive substance decays to 1/16th of its initial activity in 40 days. the half life of the radioactive substance expressed in day is : (a) 4 (b) 5 (c) 10 (d) 20
- Radioactivity » Exercise - 1 1. Plutonium decays with half life time 24000 years. If Plutonium is stored after 72000 years, the fraction of it that remain : (a) 1/2 (b) 1/4 (c) 1/8 (d) 1/12 2. A radioactive substance decays to 1/16th of its initial activity in 40 days. the half life of the radioactive substance expressed in day is : (a) 4 (b) 5 (c) 10 (d) 20 3. The half life time of a radio active elements of x is the same as the mean life of another radioactive element Y. Initially they have same number of atoms, then : (a) y will decay faster thean x (b) x will decay faster then y (c) x and y will decay at the same rate at all time (d) x and y will decay at the same rate initially 4. A and B are two radioactive substance whose half lives are 1 and 2 years respectively. Initially 10g of A and 1g of B is taken. The time after which they will have same quantity remaining is : (a) 3.6 years (b) 7 years (c) 6.6 years (d) 5 years 5. What Percent of original radio active substance is left after 5 half life time : (a) 3% (b) 5% (c)…