Radium Decay and Change Over Time

The video tutorial explains how the amount of radium changes over intervals of 1,600 years. It uses a table to show that the radium amount decreases by a factor of 2 every 1,600 years. The process is described mathematically by dividing the radium amount by 2 at each interval, which is equivalent to multiplying by 1/2. This demonstrates the concept of exponential decay in radium over time.

What is the interval of years used to observe the change in radium according to the table?

• 800 years

• 3,200 years

• 1,600 years

• 2,400 years

How does the amount of radium change over time according to the table?

• It remains the same

• It decreases by a factor

• It decreases by a constant amount

• It increases by a constant amount

By what factor does the amount of radium decrease every 1,600 years?

• 1/5

• 1/4

• 1/3

• 1/2

If the initial amount of radium is 400, what will it be after 3,200 years?

• 25

• 50

• 100

• 200

What is the equivalent operation to dividing the radium amount by 2?

• Multiplying by 2

• Multiplying by 1/2

• Adding 2

• Subtracting 2