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

Author Question: How many half-lives are required to yield a mineral with 2,000 atoms of parent isotope and 30,000 ... (Read 135 times)

asmith134

  • Hero Member
  • *****
  • Posts: 576
on: Jul 16, 2018
How many half-lives are required to yield a mineral with 2,000 atoms of parent isotope and 30,000 atoms of daughter isotope? If the half-life of the parent-daughter isotope pair is 1.0 billion years, how old is the rock? Please show your work.
 
  What will be an ideal response?

Question 2

During what geological period was the conglomerate deposited?
 
  What will be an ideal response?


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

kswal303

  • Sr. Member
  • ****
  • Posts: 316
Reply #1 on: Jul 16, 2018
Answer to Question 1

The Parent+Daughter=Total, so 2000+30000 = 32000

P D HL
32000 0 0
16000 16000 1
8000 24000 2
4000 28,000 3
2,000 30,000 4
4 x 1by = 4 billion years old

The answer is 4 half-lives have gone by; the age of the rock is 4 billion years old.

Answer to Question 2

Cretaceous, because the conglomerate contains a Cretaceous fossil. Note: Many students will conclude a Triassic age, based on the age of the cobble (sample A). This is an important opportunity to link conceptual understanding of rock-dating methods to the rock cycle.


asmith134

  • Member
  • Posts: 576
Reply 2 on: Jul 16, 2018
YES! Correct, THANKS for helping me on my review

anyusername12131

  • Member
  • Posts: 327
Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

« previous next »
 

Did you know?

Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.

Did you know?

There are more nerve cells in one human brain than there are stars in the Milky Way.

Did you know?

During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.

Did you know?

Liver spots have nothing whatsoever to do with the liver. They are a type of freckles commonly seen in older adults who have been out in the sun without sufficient sunscreen.

Did you know?

Patients who have undergone chemotherapy for the treatment of cancer often complain of a lack of mental focus; memory loss; and a general diminution in abilities such as multitasking, attention span, and general mental agility.

Tracking atoms through photosynthesis. Tracking atoms through photosynthesis.
Older adults may grieve intensely over the loss of a person or situation that has been a part of the Older adults may grieve intensely over the loss of a person or situation that has been a part of the
Types of paralysis: (A) Quadriplegia is complete or partial paralysis of the upper extremities and c Types of paralysis: (A) Quadriplegia is complete or partial paralysis of the upper extremities and c
For ice massage, ice is frozen in a cylindrical container or a paper cup (A). The top half of the cu For ice massage, ice is frozen in a cylindrical container or a paper cup (A). The top half of the cu
The Decline of Two-Parent Families The Decline of Two-Parent Families
Parent restraint of a young child during examination of the ear Parent restraint of a young child during examination of the ear
Video: Muscle Fatigue and Recovery

For a complete list of videos, visit our video library