Exam Review: Radioactivity

Which of the following is a type of radioactive decay?

• Fusion

• Alpha decay

• Fission

• Combustion

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NGSS.HS-PS1-8

What is the half-life of a substance if it takes 10 years for half of it to decay?

• 5 years

• 10 years

• 15 years

• 20 years

Which graph best represents a radioactive decay curve?

• A straight line

• An exponential curve

• A parabolic curve

• A sinusoidal curve

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NGSS.HS-PS1-8

Calculate the half-life of a substance if its initial quantity is 100 grams and it decays to 25 grams in 6 years.

• 2 years

• 3 years

• 4 years

• 6 years

Which of the following is an application of half-life in real life?

• Cooking food

• Carbon dating

• Building bridges

• Painting

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NGSS.HS-PS1-8

If a radioactive isotope has a half-life of 5 years, how much of a 200g sample will remain after 15 years?

• 25g

• 50g

• 100g

• 200g

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NGSS.HS-PS1-8

Which type of radioactive decay involves the emission of a helium nucleus?

• Beta decay

• Gamma decay

• Alpha decay

• Neutron emission

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NGSS.HS-PS1-8

A sample of a radioactive substance decreases from 80g to 10g in 12 years. What is its half-life?

• 3 years

• 4 years

• 6 years

• 8 years

Describe how you would graph the decay curve of a radioactive substance.

• Plot time on the x-axis and remaining quantity on the y-axis, showing an exponential decrease.

• Plot time on the y-axis and remaining quantity on the x-axis, showing a linear increase.

• Plot time on the x-axis and remaining quantity on the y-axis, showing a linear decrease.

• Plot time on the y-axis and remaining quantity on the x-axis, showing an exponential increase.

Tags

NGSS.HS-PS1-8

If a radioactive element has a half-life of 8 years, how many years will it take for a 160g sample to decay to 10g?

• 16 years

• 24 years

• 32 years

• 40 years