List of top Physics Questions on Nuclei asked in JCECE

A radioactive material decays by simultaneous emission of two particles with half-lives 1620 yr and 810 yr respectively. The time in year after which one-fourth of the material remains, is

A free neutron decays spontaneously into

In radioactive decay process, the negatively charged emitted (3-particles are

Half-lives of two radioactive substances A and B are respectively 20 min and 40 min. Initially the samples of A and B have equal number of nuclei. After 80 min the ratio of remaining number of A and B nuclei is