This topic contains a solution. Click here to go to the answer

Author Question: A rock sample containing an isotope with a half-life of 12 million years has an initial mass of 72 ... (Read 48 times)

sheilaspns

  • Hero Member
  • *****
  • Posts: 567
A rock sample containing an isotope with a half-life of 12 million years has an initial mass of 72 grams. How much of the parent isotope will be present after three half-lives?
 A)4.5 grams
 B)9 grams
 C)18 grams
 D)54 grams
 E)63 grams

Question 2

Creep occurs only on weathered or soil-covered surfaces of moderate slope.
  Indicate whether the statement is true or false



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

Zack0mack0101@yahoo.com

  • Sr. Member
  • ****
  • Posts: 341
Answer to Question 1

B

Answer to Question 2

False




sheilaspns

  • Member
  • Posts: 567
Reply 2 on: Jul 13, 2018
Excellent


coreycathey

  • Member
  • Posts: 333
Reply 3 on: Yesterday
Gracias!

 

Did you know?

There are approximately 3 million unintended pregnancies in the United States each year.

Did you know?

Before a vaccine is licensed in the USA, the Food and Drug Administration (FDA) reviews it for safety and effectiveness. The CDC then reviews all studies again, as well as the American Academy of Pediatrics and the American Academy of Family Physicians. Every lot of vaccine is tested before administration to the public, and the FDA regularly inspects vaccine manufacturers' facilities.

Did you know?

A recent study has found that following a diet rich in berries may slow down the aging process of the brain. This diet apparently helps to keep dopamine levels much higher than are seen in normal individuals who do not eat berries as a regular part of their diet as they enter their later years.

Did you know?

In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.

Did you know?

Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.

For a complete list of videos, visit our video library