Radioactive Decay & Half-Life: JEE Questions & Solutions

A radioactive nucleus n2 has 3 times the decay constant as compared to the decay constant of another radioactive nucleus n1. If the initial…

Choose the correct nuclear process from the below options:

A radioactive material P first decays into Q and then Q decays to non-radioactive material R. Which of the following figure represents time…

Consider the following radioactive decay process: ^21884A ^21482A1 ^21483A2 ^21483A3 ^21081A4 ^21080A5 ^21080A6 The mass number and the…

If a radioactive element with a half-life of 30 min undergoes beta decay, the fraction of the radioactive element that remains undecayed…

A radioactive element ^24292X emits two -particles, one electron, and two positrons. The product nucleus is represented by ^234PY. The…

Substance A has atomic mass number 16 and half-life of 1 day. Another substance B has atomic mass number 32 and half-life of 12 day. If…

A radioactive nucleus decays by two different processes. The half-life of the first process is 5 minutes and that of the second process is…

A free neutron decays into a proton but a free proton does not decay into neutron. This is because:

The decay constant for a radioactive nuclide is 1.5 10^-5 s^-1. Atomic weight of the substance is 60 g mole^-1 (NA = 6 10^23). The activity…

The half-life of a radioactive substance is T. The time taken for disintegrating 78 part of its original mass will be:

Two radioactive elements A and B initially have the same number of atoms. The half-life of A is the same as the average life of B. If A and…

A common example of alpha decay is ^23892 U ^23490 Th + ^42 He + Q. Given: ^23892 U = 238.05060 u, ^23490 Th = 234.04360 u, ^42 He =…

The half-life of a radioactive nucleus is 5 years. The fraction of the original sample that would decay in 15 years is