Radioactive Decay and Activity Quiz

What is the primary focus of the video tutorial?

• Calculating the speed of light

• Understanding radioactive decay and activity

• Learning about chemical reactions

• Exploring the laws of motion

How is the number of atoms of iodine-131 calculated from its mass?

• By counting each atom manually

• By using its density

• By measuring its volume

• By using Avogadro's number and molar mass

What is the unit of activity in the SI system?

• Curie

• Becquerel

• Rutherford

• Gray

What happens to the activity of a radioactive sample after one half-life?

• It becomes zero

• It reduces to half

• It remains the same

• It doubles

How many half-lives are equivalent to 87 years for strontium-90 if its half-life is approximately 29 years?

• Four

• Three

• Two

• One

What is the relationship between decay constant and half-life?

• They are equal

• They are directly proportional

• They are inversely proportional

• They are unrelated

What is the half-life of potassium-40 in years?

• 1.25 million years

• 1.25 billion years

• 1.25 trillion years

• 1.25 thousand years

Which mathematical function is used to solve for the half-life in the decay equation?

• Trigonometric function

• Logarithmic function

• Polynomial function

• Exponential function

What is the initial activity of astatine-211 in the given problem?

• 500 Becquerels

• 400 Becquerels

• 334 Becquerels

• 600 Becquerels

What is the half-life of astatine-211 calculated in the video?

• 7.2 hours

• 6.2 hours

• 8.2 hours

• 5.2 hours