Hour and Half Hour

What is the scientific term for the time it takes for half of a radioactive substance to decay?

• Half-life

• Hour-life

• Decay-time

• Radioactive-hour

Tags

NGSS.HS-PS1-8

Which of the following best describes the concept of 'half-life' in radioactive decay?

• The time it takes for a substance to completely decay

• The time it takes for half of the radioactive atoms to decay

• The time it takes for a substance to lose all its energy

• The time it takes for a substance to become non-radioactive

Tags

NGSS.HS-PS1-8

If a radioactive isotope has a half-life of 1 hour, how much of a 100g sample remains after 2 hours?

• 100g

• 50g

• 25g

• 12.5g

Tags

NGSS.HS-PS1-8

Which of the following experiments can be used to measure the half-life of a radioactive isotope?

• Measuring the temperature change over time

• Observing the color change in a chemical reaction

• Counting the number of decays per minute using a Geiger counter

• Measuring the pH change in a solution

Tags

NGSS.HS-PS1-8

In the context of half-life, what does the term 'decay constant' refer to?

• The constant rate at which a substance decays

• The time it takes for a substance to decay

• The amount of substance that decays per hour

• The energy released during decay

Tags

NGSS.HS-PS1-8

A scientist measures the half-life of a substance to be 30 minutes. How many half-lives have passed after 2 hours?

• 2

• 3

• 4

• 5

Which of the following is a real-world application of the concept of half-life?

• Measuring the speed of a car

• Determining the age of archaeological artifacts

• Calculating the distance between stars

• Predicting weather patterns

If a substance has a half-life of 3 hours, how much of a 200g sample will remain after 9 hours?

• 200g

• 100g

• 50g

• 25g

Tags

NGSS.HS-PS1-8

What is the relationship between half-life and the stability of a radioactive isotope?

• Shorter half-life means more stable

• Longer half-life means less stable

• Shorter half-life means less stable

• Half-life does not affect stability

Tags

NGSS.HS-PS1-8

Which of the following graphs best represents the decay of a radioactive substance over time?

• A straight line

• An exponential decay curve

• A sine wave

• A parabolic curve

Tags

NGSS.HS-PS1-8