ARTi
Which fundamental force do leptons completely ignore?

Meet the subatomic particles

Chapter 1

Matter's inner recipe

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Chapter 2

The lightweight wanderers

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Chapter 3

The force carriers

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Chapter 4

The mass giver

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Chapter 5

Beyond the standard model

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YOUR GOAL

Master of Meet the subatomic particles

Ch 2 · The lightweight wanderers
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hue The surprise of the heavy muon

Jul 23

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hue Ghost particles that fly through walls

Jul 23

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hue The electron and its mysterious family

Jul 23

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Little Particle Pals
BETA

hue Sort quarks, leptons, and bosons to discover the building blocks of the universe.

Jul 23

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hue The Standard Model

We'd be flying at the speed of light without the Higgs boson slowing us down

Jul 23

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hue How leptons shape our chemical world

Jul 23

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The surprise of the heavy muon

hue Muons are heavy cousins of electrons that rain down on Earth from cosmic ray collisions in the upper atmosphere.

Jul 23

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Fun Fact

Neutrino abundance: About 100 trillion neutrinos pass through your body every single second without you feeling a thing.

Jul 23

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Ghost particles that fly through walls

hue Neutrinos are nearly massless leptons that rarely interact with normal matter, making them incredibly hard to detect.

Jul 23

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Glossary
lepton (noun)
Any of a family of subatomic particles, including electrons and neutrinos, that do not experience the strong force. Léon Rosenfeld coined the term in 1948, deriving it from the Greek word for small or thin.

Jul 23

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Quiz

Who discovered the electron, the first known lepton, in the year 1897?

Jul 23

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Gossip

Would you want to see invisible neutrinos if you could?

Jul 23

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Quiz

Who first proposed the existence of the nearly invisible neutrino in 1930?

Jul 23

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Quiz

How many distinct types, or flavors, of neutrinos exist in the Standard Model?

Jul 23

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Quiz

Which of the following particles is a heavier, unstable cousin of the electron?

Jul 23

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Quiz

Which fundamental force do leptons completely ignore?

Jul 23

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Quiz

Which lepton is the heaviest and was discovered in 1975 at SLAC?

Jul 23

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Quiz

What happens to a muon after its extremely short lifespan of 2.2 microseconds?

Jul 23

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Quiz

What unique technique uses cosmic ray muons to look inside ancient structures like Egyptian pyramids?

Jul 23