Particles Intro

Which philosopher first used the Ancient Greek word for indivisible (atomos)?

• Thales

• Socrates

• Democritus

• Plato

What is the collective name for particles in the nucleus

• Nuclides

• Nuclodes

• Nuclones

• Nucleons

The diameter of a nucleus is approximately...

Antiparticles were discovered by Carl D. Anderson using a...

• cloud detector

• chamber detector

• chamber cloud

• cloud chamber

The first antimatter particle discovered was...

• a positron

• an antiproton

• a neutrino

• an electron

How many electrons have the same mass as a proton?

• 1,368

• 1,386

• 1,683

• 1,836

A neutrino and an antineutrino have

• the same mass and opposite charge

• the same mass and the same charge

• different mass and opposite charge

• different mass and the same charge

Answer explanation

antiparticles have the same mass as their particle pair but (usually) have the opposite charge - as the neutrino & antineutrino are both neutral, they both have the same charge (neutral) too

When antiparticles meet their matter pair particle, they ............................... each other

• isolate

• violate

• annihilate

• change state

When particles annihilate, what is released?

• energy

• momentum

• dark matter

• matter

Protons are made up of...

• two quarks

• three quarks

• two leptons

• three leptons