This topic contains a solution. Click here to go to the answer
« previous next »

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 89 times)

D2AR0N

  • Hero Member
  • *****
  • Posts: 561
on: Jul 28, 2018
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
Reply #1 on: Jul 28, 2018
Answer to Question 1

C

Answer to Question 2

B


D2AR0N

  • Member
  • Posts: 561
Reply 2 on: Jul 28, 2018
:D TYSM

sailorcrescent

  • Member
  • Posts: 334
Reply 3 on: Yesterday
Wow, this really help

« previous next »
 

Did you know?

Although not all of the following muscle groups are commonly used, intramuscular injections may be given into the abdominals, biceps, calves, deltoids, gluteals, laterals, pectorals, quadriceps, trapezoids, and triceps.

Did you know?

More than nineteen million Americans carry the factor V gene that causes blood clots, pulmonary embolism, and heart disease.

Did you know?

Fewer than 10% of babies are born on their exact due dates, 50% are born within 1 week of the due date, and 90% are born within 2 weeks of the date.

Did you know?

According to the Migraine Research Foundation, migraines are the third most prevalent illness in the world. Women are most affected (18%), followed by children of both sexes (10%), and men (6%).

Did you know?

As many as 28% of hospitalized patients requiring mechanical ventilators to help them breathe (for more than 48 hours) will develop ventilator-associated pneumonia. Current therapy involves intravenous antibiotics, but new antibiotics that can be inhaled (and more directly treat the infection) are being developed.

Life cycle of Obelia, a colonial cnidarian. Life cycle of Obelia, a colonial cnidarian.
Normal changes in the breast during a woman's life span Normal changes in the breast during a woman's life span
Demographic change and the effect on people social, and economic life Demographic change and the effect on people social, and economic life
Brain Hemisphere Activity Brain Hemisphere Activity
Sexual Phase of the Fungal Life Cycle Sexual Phase of the Fungal Life Cycle
The lytic and lysogenic life cycles of a temperate bacteriophage The lytic and lysogenic life cycles of a temperate bacteriophage
Video: Energy inputs and release in glycolysis Animation

For a complete list of videos, visit our video library