The neutron is made up of which one of the following quark combinations (up,down,strange,charm,top,bottom)?
A)uud
B)ddu
C)udd
D)ttb
E)bst

Question

Quizplus · Accepted Answer

The neutron is composed of two down quarks and one up quark, making the combination udd. Choice C is the only option with this combination.

Alternatively, we can eliminate choices D and E as they contain quarks that are much heavier than those typically found in nucleons. The top and charm quarks in choice D are especially heavy and unstable, and quickly decay into lighter particles. The strange and bottom quarks in choice E are still heavier than up and down quarks, but are stable enough to exist in nucleons as constituents of heavier particles like protons and mesons.

The Neutron Is Made Up of Which One of the Following