ES Hmwk; Radiometric Dating

The half-life of Uranium-238 as shown on this graph is closest to

• 2.5 billion years

• 3.5 billion years

• 4.5 billion years

• 5.5 billion years

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NGSS.HS-PS1-8

The half-life of Uranium-238 as shown on this graph is closest to

• 2.5 billion years

• 3.5 billion years

• 4.5 billion years

• 5.5 billion years

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NGSS.HS-PS1-8

Because of the half-life nature of the decay process, Uranium-238 will theoretically

• decay completely before 4.5 billion years

• decay completely in 18 billion years

• decay completely in 200 billion years

• continue to decay indefinitely

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NGSS.HS-PS1-8

Some uranium is obtained from an intrusive granite formation. It is then analyzed and found to contain approximately 1 gram of lead-206 to every 3 grams of uranium-238. Approximately how many billions of years old is the granite?

• nine

• two

• eighteen

• four

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NGSS.HS-ESS1-6

Which curve represents the expected decay rate of Uranium-238 if its temperature was raised to the melting point?

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NGSS.HS-PS1-8

NGSS.HS-PS1-5

If the decay curve for the element Carbon-14 were plotted, which diagram shows the general shape that the curve would be?

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NGSS.HS-PS1-8

The half-life of a particular radioactive substance

• decreases as pressure on it increases

• decreases as its mass decreases

• increases as the temperature increases

• is independent of mass, temperature, and pressure

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NGSS.HS-PS1-8

If a specimen of a given radioactive substance is reduced in size, its half-life

• decreases

• increases

• remains the same

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NGSS.HS-PS1-8

Which radioactive substance shown on the following graph has the longest half-life?

• A

• B

• C

• D

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NGSS.HS-PS1-8

Why is carbon-14 usually NOT used to accurately date objects more than 50,000 years old?

• Carbon-14 has a relatively short half-life, and TOO little carbon-14 is left after 50,000 years

• Carbon-14 has a relatively long half-life and NOT enough carbon-14 has decayed after 50,000 years

• Carbon-14 has been introduced as an impurity in most materials older than 50,000 years

• Carbon-14 has only existed on Earth during the last 50,000 years

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NGSS.HS-PS1-8