Radioactivity

Which particle has a negative charge

• Alpha

• Electron

• Proton

• Neutron

Tags

NGSS.HS-PS2-4

What is an isotope

• An atom with the same number of neutrons different number of protons

• An atom that has lost or gained an electron

• An atom with the same number of protons, different number of neutrons

• An atom with the same number of electrons and different neutrons

Tags

NGSS.HS-PS1-8

A scientist counts radioactivity as 120 counts per minute. The background count is 10 counts per minute. Which value should be recorded

• 12 counts per minute

• 110 counts per minute

• 130 counts per minute

• 1200 counts per minute

Tags

NGSS.HS-PS1-8

What is half life

• Time taken for a radioactive atom to decay be 1/4

• Time taken for a radioactive atom to decay by 1/3

• Time taken for a radioactive atom to decay by 1/2

• Time taken for a radioactive atom to decay by 1/5

Tags

NGSS.HS-PS1-8

Which is an alpha particle

• Fast moving electron

• 4 2 He nuclei

• fast moving positron

• EM wave

Tags

NGSS.HS-PS1-8

The centre of an atom is called

• the electron

• the proton

• the nucleus

• the neutron

Tags

NGSS.HS-PS1-8

What stops beta radiation

• Paper

• Air

• Glass

• Aluminium 3mm or thicker

Tags

NGSS.HS-PS1-8

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 is left. What was the original mass of the sample?

• 16g

• 32g

• 0.0625g

• 4g

Tags

NGSS.HS-PS1-8

Identify the type of nuclear decay shown here

²¹⁴₈₃Bi → ⁰_-1e + ²¹⁴₈₄Po

• alpha

• beta

• gamma

Tags

NGSS.HS-PS1-8