Radioactive Decay and Half-Life: A Deep Dive into Atomic Change

The video explains radioactive decay and the concept of half-life, illustrating how decay is a random event and how half-life is measured. It uses a dice analogy to demonstrate the process and provides examples with iodine and carbon-14. The video also discusses the applications of half-life in carbon dating and medicine, highlighting the presence of radioactive isotopes in everyday life. It concludes with a call to action for viewers to engage with the content.

What is the half-life of an atom if it takes 5 seconds for half of the atoms to decay?

• 1 second

• 5 seconds

• 2.5 seconds

• 10 seconds

In the dice analogy, what does removing the dice showing a six represent?

• Stabilizing the atoms

• Doubling the atoms

• Decay of atoms

• Adding more atoms

What does a graph showing the decay of iodine-131 indicate about its half-life?

• It triples every 8 days

• It halves every 8 days

• It remains constant

• It doubles every 8 days

How long is the half-life of carbon-14?

• 29 years

• 1000 years

• 5730 years

• 8 days

What happens to the carbon-14 levels in an organism after it dies?

• They remain constant

• They increase

• They double

• They decay away

How many half-lives have passed if a sample contains 25% of its original carbon-14 content?

• Three

• Two

• Four

• One

Why is radiocarbon dating unreliable after about 10 half-lives?

• Too much C14 remains

• Too little C14 remains

• C14 becomes C12

• C14 levels increase

What is the half-life of strontium-90?

• 1 billion years

• 5730 years

• 29 years

• 8 days

What is a common source of radioactive potassium-40 in our diet?

• Bananas

• Apples

• Oranges

• Grapes

How long does it take for strontium-90 to begin vanishing from the Earth?

• 29 years

• 120 years

• 5730 years

• 8 days