Scientists in areas such as geology, paleontology, and archaeology use “radiodating” techniques (such as carbon dating) in the study of the history of the Earth and its inhabitants. There are several radiodating techniques, each using different nuclei: 

(i) carbon 14, 

(ii) potassium–argon 40, 

(iii) rubidium– strontium, 

 (iv) uranium–lead. 

(a) Approximately how old an object can be dated with each of these techniques? 

(b) Conversely, what are the youngest objects that can be reliably dated with each technique? 

(c) Which techniques are best for archaeology? For paleontology? You may have to look up the half-lives of the relevant parent isotopes for the elements used in each method.