Half Life and Radioactivity

What is a Geiger counter?

• an instrument that uses sonar to bounce sound waves off the ocean bottom

• an instrument that measures vibrations in the ground

• an instrument that detects the particles emitted or given off by decaying atoms

Tags

NGSS.HS-PS1-8

What is a half-life?

• the time required for one half of the radioactive atoms in a sample to decay

• the time required for one third of the radioactive atoms in a sample to decay

Tags

NGSS.HS-PS1-8

When the radioactive atoms in a sample decay by half...

• alpha decay

• Beta decay

• half-life

Tags

NGSS.HS-PS1-8

Uranium238 take _________________for one half-life.

• 5730 years

• 20 billion

• 1.65 million

• 4.5 billion

Tags

NGSS.HS-PS1-8

What is the half-life of the radioactive substance?

• 50%

• 25%

• 5 years

• 10 years

Tags

NGSS.HS-PS1-8

Identify the half life of the substance shown in the graph.

• 4 days

• 8 days

• 12 days

• 16 days

Tags

NGSS.HS-PS1-8

After 2 half lives, what percent is the parent isotope?

• 100%

• 50%

• 75%

• 25%

Tags

NGSS.HS-PS1-8

How long is one half life of C-14

• 5730

• 11460

• 17190

• 28650

Tags

NGSS.HS-ESS2-6

After 200 million years 1/16 of a radioactive waste remains.  How many million years is the half life of this substance?

Mathematical Equivalence

ON

After 200 million years 1/16 of a radioactive waste remains.  How many million years is the half life of this substance?

Mathematical Equivalence

ON