Radioactivity Test

What is the mass number of this isotope?

• 131

• 53

• 184

• 78

What is the atomic number of this isotope?

• 131

• 53

• 184

• 78

An alpha particle is made up of

• 2 protons and 4 neutrons

• 1 proton and 1 neutron

• 2 protons and 2 neutrons

• 4 protons and 2 neutrons

Which type of nuclear radiation can be stopped by a sheet of paper?

• Alpha

• Beta

• Gamma

Which type of nuclear radiation can be stopped 60 cm of aluminum or 7 cm of lead?

• Alpha

• Beta

• Gamma

When a substance undergoes beta decay

• The atomic number increases by 1

• The atomic number decreases by 2

• The atomic number does not change

How much of a 250g sample would be left after 5 half lives?

• 125g

• 62.5g

• 31.25g

• 7.81g

A sample of Radium-228 decays from 100g to 12.5g. How many half lives did it experience?

• 1

• 2

• 3

• 4

If the half life of Uranium-240 was 10 years, how long would it take for it to decay from 310g to 80g?

• 10 years

• 240 years

• 20 years

• 30 years

This image shows

• nuclear fission

• nuclear fusion