The number of average molecular mass and mass average molecular mass of a polymer are respectively 30,000 and 40,000. They poly dispersity of the polymer is:

The number average molecular mass and mass average molecular mass of a polymer are respectively 30,000 and 40,000. The poly dispersity of the polymer is:

The mass average molecular mass and number average molecular mass of a polymer are respectively 40,000 and 30,000. The poly dispersity index of polymer will be

Mass-average molecular mass of a polymer is determined by:

Mass-average molecular mass of a polymer is determined by: