The life story and political career of Thulas Nxesi, SA's Minister of Labour

Pretoria High court dismisses Mthunzi Mdwaba's application against Thulas Nxesi

SOLVED: A sample of thulium-171 has a mass of 0.4055 g and is radioactive. How much of this sample is left after 6 half-lives?A. 0.02534 gB. 0.01267 gC. 0.006336 gD. 0.05069 g

SOLVED: The electron affinity of thulium has been measured by laser photodetachment electron spectroscopy. In this technique a gaseous beam of the anions of an element is bombarded with photons from a laser. The photons eject electrons from some of the anions and the energies of the ejected electrons are detected. The photons had a wavelength of 1064  nm and the ejected electrons had an energy of 0.137 eV. Although the analysis is somewhat more complicated, we can obtain a rough estimate of the