Particle physics part 1

The picture shows equipment used by Ernest Walton and John Cockcroft in 1932. What did the machine do?

• it separated electrons from the nucleus

• it created a controlled fusion reaction

• it fired alpha particles at gold foil

• it caused protons to accelerate

Why was the Cockcroft Walton experiment so significant? (2 answers)

• it proved E = mc²

• it was the first controlled fusion reaction

• it proved that energy can be destroyed

• the proton was artificially accelerated

How were the alpha particles detected in the Cockcroft Walton experiment?

• they made a noise when they struck a detector

• they could observe them directly through the microscope

• they caused a zinc sulphide screen to emit a flash of light

• they made the GM tube make a beeping noise

How was the proton accelerated in the Cockcroft Walton experiment?

• by using a very strong magnetic field

• by using a very strong electric field

• by pushing them

• by heating them up

Why do modern particle accelerators have a circular loop?

• it allows smaller particles to float to the top

• the particles can only rotate clockwise

• it is cheaper to construct

• the particles have a longer path to accelerate and can reach greater speeds

How are the particles kept in a circular path in a particle accelerator?

• magnetic field

• electric field

• heat

• lasers

What is shown in the picture?

• alpha particle

• beta particle

• gamma ray

• proton

What is shown in the picture?

• alpha particle

• beta particle

• gamma ray

• proton

What is shown in the picture?

• alpha particle

• beta particle

• gamma ray

• proton

What is shown in the picture?

• alpha particle

• beta particle

• gamma ray

• proton