1. What is the name for atoms with the same number of protons but different number of neutrons

• ions

• isotopes

The count rate of a radioactive sample falls from 130 Bq to 65 Bq in 15 minutes. What is its half-life

• 15 minutes

• 30 minutes

• 60 minutes

True or false? "Living cells can be damaged by ionising radiation."

• True

• False

True or false? "The results of the alpha scattering experiment led to the development of the plum pudding model of the atom."

• True

• False

Which type of radiation is the least ionising?

• Alpha

• Beta

• Gamma

The typical size of an atom is approximately...

• 1 x 10^-12 m

• 1 x 10^-10 m

• 1 x 10¹⁰ m

True or false? "When a radioactive nucleus emits a beta-minus particle, its atomic number increases."

• True

• False

What is the unit of activity of a radioactive isotope?

• Hertz, Hz

• Becquerel, Bq

Which piece of equipment can be used to detect radioactivity?

• Filter paper

• X-ray

• Geiger-Muller tube

Tick which are NOT sources of background of radiation

• Naturally occurring isotopes in the air

• books

• soft furnishing

• cosmic rays

• nuclear waste