Radioactive

What percentage of Rubidium-87 will remain after 4 half-lives?

• 25%

• 12.5%

• 6.25%

• 3.125%

Tags

NGSS.HS-PS1-8

The shaded boxes represent the undecayed atoms for Isotope "X". If Isotope X has a half-life of 1,000 years, how old is this sample?

• 1,000 years

• 2,000 years

• 3,000 years

• 4,000 years

Tags

NGSS.HS-PS1-8

A sample of wood that originally contained 100 grams of Carbon-14 now contains 12.5 grams. How old is this sample?

• 5.7 x 10³

• 11.4 x 10³

• 17.1 x 10³

• 22.8 x 10³

An element that has broken down and released particles and energy is said to be __________________.

• radioactive

• igneous

• half-life

• sad

Tags

NGSS.HS-PS1-8

_________________ is a method of determining the absolute ages of rocks.

• Radioactive dating

• Radioactive decay

• Relative age

• Counting the rings of a rock

Tags

NGSS.HS-PS1-8

________________ is the time it takes for half of the radioactive atoms in an element to decay.

• Half-life

• Radiation

• Relative age

• Full-life

Tags

NGSS.HS-PS1-8

During _________________, the atoms of one element break down to form atoms of another element.

• radioactive decay

• relative dating

• absolute age

• tooth decay

Tags

NGSS.HS-PS1-8

Some elements can decay over time.

• true

• false- all elements

Tags

NGSS.HS-PS1-8

The rate of decay of any radioactive element changes frequently.

• false- it never changes

• true

Tags

NGSS.HS-PS1-8

Geologist use radioactive dating to determine the absolute age of rocks.

• true

• false- relative age