Edexcel A-Level Physics Particles and Antiparticles

Practise Edexcel A-Level Physics particles and antiparticles by comparing mass, charge, lepton number and quark content.

Exam points

deduce antiparticle properties from same mass and opposite charge or lepton number
combine quark and antiquark charges to identify possible tetraquark structures

[Maximum number: 3]

In 1932, Carl Anderson published this photograph of a track in a cloud chamber. The cloud chamber contained a lead plate. There was a magnetic field perpendicular to the plane of the track.

Figure for Question 4.5.122 - Particles and antiparticles question 1 — Edexcel A-Level Physics A2

The photograph shows the track of a positron from cosmic rays and is the first photographic record of the existence of an antiparticle.

State the properties of a positron that show it is the antiparticle to the electron.

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4.5.122 - Particles and antiparticles question 1