Radioactive Decay and Half-Life Concepts

What is Half-life?

• The amount of time it takes for some of the nuclei in a sample of the isotope to decay
• The amount of time it takes for half the electrons in a sample of the isotope to decay
• The amount of time it takes for half the nuclei in a sample of the isotope to decay
• the amount of time it takes to double the nuclei in a sample of the isotope to decay

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NGSS.HS-PS1-8

Which of the following nuclear emissions has the greatest penetrating power?

• alpha
• gamma
• beta
• positron

In Gamma decay what particle is emitted?

• Helium (He)

• Electron (e^-)

• Energy (Photon)

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NGSS.HS-PS1-8

When an unstable radioactive atom decays, it usually turns into:

• a more stable atom
• a less stable atom
• the exact same atom but with less pure energy
• empty space

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NGSS.HS-PS1-8

What is the only difference between two different isotopes of the same element?

• Number of neutrons

• Number of protons

• Number of electrons

• Size of atom

When does radioactive decay occur?

• When the nucleus of an isotope is unstable
• When the nucleus of an isotope is stable
• When the electrons of an isotope are spinning
• When the electrons of an isotope are shared with another isotope

Tags

NGSS.HS-PS1-8

The time it takes for a radioactivity level to drop by a half is is the sample's ___________________.

• quarter life

• whole life

• wonderful life

• half life

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NGSS.HS-PS1-8

Which type of radiation is stopped by lead and concrete?

• Alpha

• Beta

• Gamma

• Neutron

Which order is correct for the most to least ionising

• Alpha-Beta-Gamma

• Beta-Alpha-Gamma

• Gamma-Beta-Alpha

• Gamma-Alpha-Beta

Which type of radiation has 2 protons and 2 neutrons

• Alpha

• Beta

• Gamma

• Neutron

Tags

NGSS.HS-PS1-8