JEE Main 201910 Jan, Morning shiftPhysicsMediumAtoms and Nuclei183× since 2002
Using a nuclear counter the count rate of emitted particles from a radioactive source is measured. At t = 0 it was 1600 counts per second and t = 8 seconds it was 100 counts per second. The count rate observed, as counts per second, at t = 6 seconds is close to -