Question

(a) Deduce the expression, $N=N_{0}.e^{-\lambda t}$, for the law of radioactive decay.
(b) (i) Write symbolically the process expressing the β⁺ decay of $_{11}^{22}Na$. Also write the basic nuclear process underlying this decay.
(ii) Is the nucleus formed in the decay of the nucleus $_{11}^{22}Na$, an isotope or isobar?

Answer 1

The digestive system of Branchiostoma consists of an alimentary canal and digestive glands. The alimentary canal is again divided into mouth, oral hood and buccal cavity (vestibule), pharynx or branchial sac, oesophagus, intestine and anus.