Radioactive Decay and Half-Life Problems

The video tutorial by kscience.com explains half-life graphs, focusing on the activity of radioactive sources over time. It provides examples of half-lives in different units, such as minutes and years, demonstrating how activity decreases by half over each half-life period. The video includes practice questions to reinforce understanding and encourages viewers to visit kscience.com for more resources.

What is the unit of measurement for radioactive activity?

• Seconds

• Hours

• Minutes

• Bacquerels

If a radioactive sample has a half-life of 10 minutes, what will its activity be after 20 minutes if it starts at 160 Bacquerels?

• 80 Bacquerels

• 160 Bacquerels

• 40 Bacquerels

• 20 Bacquerels

How many Bacquerels will remain after 30 minutes if the initial activity is 160 Bacquerels and the half-life is 10 minutes?

• 80 Bacquerels

• 40 Bacquerels

• 20 Bacquerels

• 10 Bacquerels

What happens to the activity of a radioactive isotope every 10 minutes if its half-life is 10 minutes?

• It doubles

• It remains the same

• It decreases by half

• It triples

In the 2-year half-life example, what is the activity after 4 years if it starts at 800 Bacquerels?

• 800 Bacquerels

• 400 Bacquerels

• 100 Bacquerels

• 200 Bacquerels

After 6 years, what will the activity be if the initial activity is 800 Bacquerels and the half-life is 2 years?

• 50 Bacquerels

• 400 Bacquerels

• 200 Bacquerels

• 100 Bacquerels

How many years does it take for the activity to reduce from 800 Bacquerels to 100 Bacquerels in the 2-year half-life example?

• 4 years

• 8 years

• 2 years

• 6 years

What is the activity after 12 years if the initial activity is 800 Bacquerels and the half-life is 2 years?

• 25 Bacquerels

• 50 Bacquerels

• 12.5 Bacquerels

• 6.25 Bacquerels

What should you do if you are stuck on a question according to the video?

• Skip it

• Re-watch the video

• Ask a friend

• Guess the answer

Where can you find more resources related to this topic?

• kscience.com

• Google

• Wikipedia

• YouTube