Radioactivity and Half-Life

Which is the best definition of half-life?

• Half the mass of the substance is left.

• Only half the time taken for decay to occur

• time taken for radioactivity to halve.

• Half total decay occurs in a certain time.

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NGSS.HS-PS1-8

Using this graph, what is the half-life of the strontium?

• 10 years

• 25 years

• 50 years

• 150 years

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NGSS.HS-PS1-8

The rate at which a radioactive element decays is its ____.

• quarter life

• whole life

• wonderful life 

• half life

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NGSS.HS-PS1-8

A certain radioactive sample has a half life of 2 years. After 6 years, how much of the sample is left?

• 1/2

• 1/3

• 1/16

• 1/8

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NGSS.HS-PS1-8

The half-life for a 100-gram sample of radioactive element X is 5 days. How much of element X remains after 10 days have passed?

• 25 grams

• 50 grams

• 75 grams

• 100 grams

Which type of radiation is stopped by lead and concrete?

• Alpha

• Beta

• Gamma

• Neutron

Which type of radiation has 2 protons and 2 neutrons

• Alpha

• Beta

• Gamma

• Neutron

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NGSS.HS-PS1-8

In beta becay…..

• A neutron becomes a proton and an electron

• A proton becomes a neutrons and an electron

• A electron becomes a protons and a neutron

• It's just a wave

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NGSS.HS-PS1-8

Which two types of radioactive decay cause an atom of a new element to form?

• Alpha and Beta

• Beta and Gamma

• Alpha and Gamma

• None, no new element would form.

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NGSS.HS-PS1-8

The three types of nuclear radiation in order of decreasing penetrating power are

• alpha, beta, gamma

• alpha, gamma, beta

• beta, alpha, gamma

• gamma, alpha, beta

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NGSS.HS-PS1-8