D is electron. Solved problem . A radon specimen emits radiation of . × GBq per second.
Convert this disintegration in terms of curie. (one curie = . × disintegration per second) Bq = one disintegration per second one curie = . × Bq Bq = curie ∴ .
× G Bq = . × × × . × = curie Solved problem . U experiences one α - decay and one β - decay.
Find number of neutrons in the final daughter nucleus that is formed. Solution: Let X and Y be the resulting nucleus after the emission of the alpha and beta particles respectively. U α decay X + He X β decay Y + - e Number of neutrons = Mass number – Atomic number = – = Solved problem . Calculate the amount of energy released when a radioactive substance undergoes fusion and results in a mass defect of kg.
Solution: Mass defect in the reaction (m) = kg Velocity of light (c) = × m s - By Einstein’s equation, Energy released E = mc So E = × ( × ) = . × J Points to Remember This phenomenon of spontaneous emission of radiation from certain elements on its own is called 'natural radioactivity'. Curie is defined as the quantity of a radioactive substance, which undergoes . × disintegrations in one second.
This is actually close to the activity of g of radium- . . × Rutherford (Rd) is defined as the quantity of a radioactive substance which produces disintegrations in one second. Rd = disintegrations per second.
The SI unit of radioactivity is becquerel. It is defined as the quantity of one disintegration per second. Helium nucleus ( He