Lesson: Up Quarks and Down Quarks
In this lesson, we will learn how to describe the properties of up and down quarks and the composition of protons and neutrons.
Sample Question Videos
Worksheet: 13 Questions • 1 Video
|Quark||Relative Charge||Relative Mass|
A group of physicists detect a particle that has a relative charge of and a mass times the mass of a proton. Which of the following composite particles, made of up and down quarks, could the mysterious particle be?
The diagram shows 4 composite particles. Each particle is made up of 3 quarks. Quarks with the letter u are up quarks, and quarks with the letter d are down quarks. Red particles are particles with a positive electric charge, and blue particles are particles with a negative electric charge.
Which of the 4 composite particles is a proton?
Which of the 4 composite particles is a neutron?
The nucleus of a helium-4 atom contains 2 protons and 2 neutrons.
How many up quarks are in the nucleus in total?
How many down quarks are in the nucleus in total?