We have to find the quark combinations which form (a) , (b) .

Solution:             Click For PDF Version

Properties of the fundamental quarks are as given in the following table:

Quark	Symbol	Charge (e)	Spin	Baryon Number	Strangeness
Up	u				0
Down	d				0
Strange	s				-1

(a)

As is a baryon with baryon number 1, it consists of three quarks, and as its charge is zero and its strangeness is , it is described by the quark combination uds.

(b)

As is a baryon with baryon number 1, it consists of three quarks, and as its charge is zero and its strangeness is , it is described by the quark combination uss.