Answer 1

Nuclear radius of the gold isotope `""_79Au^197` = R_Au

Nuclear radius of the silver isotope `""_47Ag^107` = R_Ag

Mass number of gold, A_Au = 197

Mass number of silver, A_Ag = 107

The ratio of the radii of the two nuclei is related with their mass numbers as:

`R_"Au"/R_"Ag" = (R_"Au"/R_"Ag")^(1/3)`

`= (197/107)^(1/3) = 1.2256`

Hence, the ratio of the nuclear radii of the gold and silver isotopes is about 1.23.