Introduction to Half-Life Radioactivity

Radioactivity and Half life

Multiple Choice

In beta becay…..

• A neutron becomes a proton and an electron

• A proton becomes a neutrons and an electron

• A electron becomes a protons and a neutron

• It's just a wave

Multiple Choice

Which type of radiation has 2 protons and 2 neutrons

• Alpha

• Beta

• Gamma

• Neutron

Multiple Choice

Which type of radiation is stopped by lead and concrete?

• Alpha

• Beta

• Gamma

• Neutron

Multiple Choice

This image shows

• nuclear fission

• nuclear fusion

Multiple Choice

This image shows

• Nuclear fission

• Nuclear fusion

Multiple Choice

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

• 125g

• 62.5g

• 31.25g

• 7.81g

Multiple Choice

Energy in the sun is produced as a result of nuclear ____ reactions.

• fusion
• fission
• waste
• sub

Multiple Choice

If one has 12 kg of Polonium and it undergoes two half-lives, how much do you have left?

• 12 kg

• 3 kg

• 6 kg

Multiple Choice

Using this graph, what is the half-life of the strontium?

• 10 years

• 25 years

• 50 years

• 150 years

Multiple Choice

If the radioactivity of a substance starts at 500 Bequerels. What will the radioactivity be after one half life?

• 1000

• 250

• 125

• 500

Multiple Choice

Which is the best definition of half-life?

• Half the mass of the substance is left.

• Only half the time taken for decay to occur

• time taken for radioactivity to halve.

• Half total decay occurs in a certain time.