Antimatter

High school (ages 12+)
Science & Technology

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/antimatter

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. Who discovered Antimatter?The positron (anti-electron) was experimentally discovered by Carl D. Anderson in 1932
2. What is the theoretical prediction?Predicted by Paul Dirac's relativistic quantum mechanics equation in 1928
3. How did scientists discover antimatter?In 1932, Carl Anderson saw a particle called the positron that has the same mass as an electron but a positive charge, proving that antimatter exists.
4. Why is there more matter than antimatter in the universe?The Big Bang should have made equal amounts, but a tiny excess of matter, called baryogenesis, left the universe full of matter instead of everything annihilating.

Baryogenesis: The hypothetical process that produced an asymmetry between matter and antimatter in the early universe.
CP Violation: A phenomenon where the laws of physics are different for matter and antimatter, leading to their unequal production or decay.
Penning Trap: A device that uses a combination of electric and magnetic fields to confine charged particles, including antiparticles.