Quiz on Radioactive Decay and Half-Life

What is the main topic discussed in the video?

• Photosynthesis

• Chemical reactions

• Nuclear fusion

• Random decay

What is the definition of half-life in terms of activity?

• Time taken for activity to remain constant

• Time taken for all atoms to decay

• Time taken for activity to half

• Time taken for activity to double

What is the activity of a radioactive sample?

• Number of atoms in a sample

• Number of counts of radiation per second

• Number of stable atoms

• Number of electrons in an atom

What does a GM tube measure?

• Temperature

• Pressure

• Mass of a sample

• Count rate of radiation

How many half-lives does it take for the activity to go from 80 to 10 counts per minute?

• 1

• 2

• 3

• 4

What is the half-life if the activity decreases from 80 to 10 counts per minute in 6 hours?

• 2 hours

• 3 hours

• 4 hours

• 1 hour

What is the initial activity in the graph example?

• 8 counts per minute

• 6 counts per minute

• 4 counts per minute

• 2 counts per minute

What is the time taken for the activity to half in the graph example?

• 5 hours

• 2 hours

• 3 hours

• 4 hours

What is the second definition of half-life?

• Time taken for all nuclei to decay

• Time taken for the activity to double

• Time taken for half of the undecayed nuclei to decay

• Time taken for the activity to remain constant

What happens to the activity as more nuclei decay?

• It increases

• It remains constant

• It decreases

• It fluctuates randomly