List of top Physics Questions on Decay Rate

If the radius of earth is reduced to three-fourth of its present value without change in its mass then value of duration of the day of earth will be ______ hours 30 minutes.

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. (\(N_A = 6×10^{23}\)). The activity of 1.0 µg of the substance is _____\(×10^{10}\) Bq.

After two hours, one-sixteenth of the starting amount of a certain radioactive isotope remained undecayed. The half life of the isotope is
In an ore containing uranium, the ratio of \(^{238}\text{U}\) to \(^{206}\text{Pb}\) is \(3:1\). Calculate the age of the ore, assuming that all the lead present in the ore is the final stable product of \(^{238}\text{U}\). Take the half-life of \(^{238}\text{U}\) to be \(4.5\times10^9\) yr.