Radioactivity and Half-Life

Source of radioactivity - primordial definition

• as a result of cosmic ray interactions

• due to human actions

• from before the creation of the earth

• natural causes

Tags

NGSS.HS-PS1-8

What's the name of this isotope?

• Iodine-131

• Iodine-53

• Iodine-184

• Iodine-78

Tags

NGSS.HS-PS1-8

A radioactive shoe is wrapped in 3mm of aluminum foil but radiation is still detected. What must be true?

• The shoe emits alpha radiation

• The shoe emits beta radiation

• The shoe emits gamma radiation

Tags

NGSS.HS-PS1-8

A sample of Radium-228 decays from 100g to 12.5g. How many half lives did it experience?

• 1

• 2

• 3

• 4

Tags

NGSS.HS-PS1-8

If the half life of Uranium-240 was 10 years, how long would it take for it to decay from 310g to 80g?

• 10 years

• 240 years

• 20 years

• 30 years

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

• 16g

• 32g

• 0.0625g

• 4g

Tags

NGSS.HS-PS1-8

The half-life of strontium-90 is 25 years. How much strontium-90 will remain after 100 years if the initial amount is 4.0 g?

• 3.0g

• 0.25mg

• 0.3g

• 0.25g

Tags

NGSS.HS-PS1-8

What is the atomic number of this isotope?

• 131

• 53

• 184

• 78

Tags

NGSS.HS-PS1-8

How many neutrons does this isotope have?

• 131

• 53

• 184

• 78

Tags

NGSS.HS-PS1-8

Which type of nuclear radiation can be stopped by a sheet of paper?

• Alpha

• Beta

• Gamma