Fundamental Particles

In the standard model, the particle considered to be an elementary particle is a(n)

• proton
• neutron
• electron
• alpha particle

A proton is made up of two up quarks and one down quark with charges of +2/3, +2/3, and –1/3. 

• True 
• False
• More information is needed

In the early twentieth century the apparatus shown in the diagram was used to investigate atomic structure. When He²⁺ particles were fired at a thin sheet of gold, most of the particles were detected at point P. What conclusion can be drawn from the detection of He²⁺ particles at point P?

• Gold atoms contain electrons.

• Gold atoms contain protons.

• Gold atoms contain neutrons.

• Gold atoms are mainly empty space.

This model was developed after J.J. Thompson discovered electrons, a particle smaller than an atom. Is shows electrons floating freely in a positive space.

• The "Plum Pudding Model" of the atom
• The "Rutherford Model" of the atom
• Democritus's model of the atom
• The "Solar System Model" of the atom

Which one of the following parts of the atom is the smallest?

• nucleus

• electron

• quark

What is a proton made up of ?

• two up quarks and one down quark
• two charm quarks and three strange quarks
• one top quark and two bottom quarks
• it is indivisible

What is a neutron made up of?

• it is indivisible
• two down quarks and one up quark
• one strange quark and two charm quarks 
• no up quarks and one down quark

What is a electron made up of?

• it is indivisible
• three up quarks and one down quark
• no down quarks and one up quark
• three strange quarks and one charm quark

Often seen with the up quark, its partner in the "first generation of matter", the down quark is slightly heavier and just as fun. In terms of e (the charge of a proton), what is the electric charge of a down quark?

• +2/3 e

• -e

• +e

• -1/3 e

The relative mass of a proton/neutron is.....

• 0
• 1
• 2
• 3