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

Author Question: The half-life of 131I is 8.04 days. Three days after it was prepared, its activity was 0.50 mCi. How ... (Read 91 times)

D2AR0N

  • Hero Member
  • *****
  • Posts: 561
The half-life of 131I is 8.04 days. Three days after it was prepared, its activity was 0.50 mCi. How many curies (in mCi) were initially prepared?
 a. .60
  b. .70
  c. .65
  d. .55
  e. .39

Question 2

44 g of petrified wood was found in a petrified forest. A sample showed a 14C activity of 100 decays/minute. How long has the tree been dead (in years)? (The half-life of carbon-14 is 5730 years and freshly cut wood contains 6.5  1010 atoms of 14C per gram.)
 a. 12 300
  b. 15 600
  c. 8 500
  d. 4 700
  e. 2 400



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

skipfourms123

  • Sr. Member
  • ****
  • Posts: 343
Answer to Question 1

C

Answer to Question 2

B




D2AR0N

  • Member
  • Posts: 561
Reply 2 on: Jul 28, 2018
Thanks for the timely response, appreciate it


sultansheikh

  • Member
  • Posts: 335
Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

 

Did you know?

Children of people with alcoholism are more inclined to drink alcohol or use hard drugs. In fact, they are 400 times more likely to use hard drugs than those who do not have a family history of alcohol addiction.

Did you know?

The calories found in one piece of cherry cheesecake could light a 60-watt light bulb for 1.5 hours.

Did you know?

The U.S. Pharmacopeia Medication Errors Reporting Program states that approximately 50% of all medication errors involve insulin.

Did you know?

On average, the stomach produces 2 L of hydrochloric acid per day.

Did you know?

Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.

For a complete list of videos, visit our video library