P4 Radioactivity

What type of radiation was discovered to be stopped by paper?

• X-ray

• Gamma radiation

• Beta radiation

• Alpha radiation

Who invented the Geiger counter?

• Marie Curie

• Niels Bohr

• Pierre Curie

• Hans Geiger

What did Rutherford's alpha particle scattering experiment prove?

• Atoms are mostly empty space

• All of the above

• Atoms have a positively charged nucleus

• Electrons orbit the nucleus

What is the relative mass of a neutron?

• 1

• 0

• 1/2000

• 4

What increases in a nucleus when a beta particle is emitted?

• Stability

• Neutron number

• Atomic number

• Mass number

What is the half-life of a radioactive isotope?

• Time it takes for all its atoms to decay

• Time it takes for its radioactivity to start

• Average time it takes for half of the nuclei to decay

• Time it takes for its radioactivity to double

Which radiation is most dangerous inside the body?

• Alpha radiation

• Beta radiation

• Gamma radiation

• X-ray

What is the main purpose of using a Geiger counter?

• To measure the temperature of radioactive substances

• To detect radioactivity

• To measure the weight of radioactive substances

• To visualize radioactive substances