« previous next »

Author Question: If the half-life of some radioactive element is 1 billion years, and a mass of rock originally ... (Read 52 times)

joblessjake

  • Hero Member
  • *****
  • Posts: 555
on: Jul 29, 2018
If the half-life of some radioactive element is 1 billion years, and a mass of rock originally contained 100 g of that element, how many grams of the radioactive element would be left after three billion years had passed?
 
  A) 6.25 g
  B) 12.5 g
  C) 25 g
  D) 50 g
  E) none

Question 2

The numerical dates associated with events on the geologic time scale were determined by
 
  A) relative dating.
  B) superposition.
  C) radiometric dating.
  D) fossil assemblages through time.


Christopher

  • Sr. Member
  • ****
  • Posts: 316
Reply #1 on: Jul 29, 2018
Answer to Question 1

Answer: E

Answer to Question 2

Answer: C


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question

joblessjake

  • Hero Member
  • *****
  • Posts: 555
Reply #2 on: Jul 29, 2018
Both answers were spot on, thank you once again


Christopher

  • Sr. Member
  • ****
  • Posts: 316
Reply #3 on: Jul 29, 2018
Great! Please up vote :D


« previous next »
 

Did you know?

Once thought to have neurofibromatosis, Joseph Merrick (also known as "the elephant man") is now, in retrospect, thought by clinical experts to have had Proteus syndrome. This endocrine disease causes continued and abnormal growth of the bones, muscles, skin, and so on and can become completely debilitating with severe deformities occurring anywhere on the body.

Did you know?

Approximately one in four people diagnosed with diabetes will develop foot problems. Of these, about one-third will require lower extremity amputation.

Did you know?

Signs and symptoms that may signify an eye tumor include general blurred vision, bulging eye(s), double vision, a sensation of a foreign body in the eye(s), iris defects, limited ability to move the eyelid(s), limited ability to move the eye(s), pain or discomfort in or around the eyes or eyelids, red or pink eyes, white or cloud spots on the eye(s), colored spots on the eyelid(s), swelling around the eyes, swollen eyelid(s), and general vision loss.

Did you know?

Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.

Did you know?

Lower drug doses for elderly patients should be used first, with titrations of the dose as tolerated to prevent unwanted drug-related pharmacodynamic effects.

Life cycle of moss Life cycle of moss
World Population Growth, Past 10,000 years World Population Growth, Past 10,000 years
In The Gross Clinic (1875), by Thomas Eakins, Professor Samuel Gross’s team of surgeons cuts through In The Gross Clinic (1875), by Thomas Eakins, Professor Samuel Gross’s team of surgeons cuts through
There has been a widespread loss of glacier mass globally There has been a widespread loss of glacier mass globally
Siri plans to retire in 18 years and would like to receive $10 000.00 per month for twenty ... Siri plans to retire in 18 years and would like to receive $10 000.00 per month for twenty ...
Structural organization of a copia transposable element in Drosophila Structural organization of a copia transposable element in Drosophila
Video: Introduction to Heart Attacks

For a complete list of videos, visit our video library