Form 3 Chapter 8: RADIOACTIVITY

which form of radiation is stopped by aluminium but not paper?

• Alpha

• Beta

• Gamma

Which form of radiation is not deflected in an electric or magnetic field?

• Alpha

• Beta

• Gamma

Radioactivity is spontaneous and random.

• True

• False

What form of radioactive decay that reduces the atomic number or number of protons by 2?

• Alpha

• Beta

• Gamma

• None of the answers listed

What do we call the tiny core at the center of an atom?

• Electron

• Neutron

• Proton

• Nucleus

how much time has passed after 3 half lives?

• 29 years

• 87 years

• 58 years

• 116 years

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

What type of decay is shown here

²³⁸₉₂U ---> ²³⁴₉₀Th + ⁴₂He.

• alpha

• beta

• gamma

Tags

NGSS.HS-PS1-8

After 4 half-lives, 1g of a sample of Krypton-85 remains unchanged.  What was the original mass of the sample?

• 16g
• 32g
• 0.0625g
• 4g

Tags

NGSS.MS-PS1-5

Identify the type of nuclear decay shown here

²¹⁴₈₃Bi → ⁰_-1e + ²¹⁴₈₄Po

• alpha

• beta

• gamma

Tags

NGSS.HS-PS1-8