Question

The following graph shows the rates of decay for four parent isotopes. Based on the graph, which parent isotope most likely has a half-life of 4.5 billion years?

Graph showing the rates of decay for four parent isotopes, labeled A, B, C, and D. After 4.5 billion years, approximately 1 percent of parent isotope A exists; approximately 50 percent of parent isotope B exists; approximately 85 percent of parent isotope C exists; and approximately 95 percent of parent isotope D exists.

Public Domain

A

B

C

D

Answer 1

@kaylaprincess

Answer 2

Give me a couple minuets

Answer 3

Okay no problem. Thanks for taking a look at the question. I appreciate it. :)

Answer 4

mhm.

Answer 5

AHA! Got it.

Answer 6

I put B but I wasn't completely positive on that

Answer 7

Numerical Time

•Radioactive decay of unstable isotopes can be used to
determine the age of igneous and metamorphic rocks.
•Radioactive decay occurs when a parent isotope gains or
loses protons, neutrons, and/or electrons as it is converted
to a daughter atom.
•The half-life is the length of time taken for half of the
radioactive material to decay.

Answer 8

// theres more dont worry

Answer 9

lol

Answer 10

Haha thanks. :)

Answer 11

So is B correct?

Answer 12

Heres another one if you don't mind takin a look?

As potassium-40 decays, it becomes argon-40, as shown in the following graph.

Graph showing the decay of potassium-40 over time. After 1 half-life, a sample is half potassium-40 and half argon-40. After 2 half-lives, the sample is one-fourth potassium-40 and three-fourths argon-40. After 3 half-lives, the sample is one-eighth potassium-40 and seven-eighths argon-40. After 4 half-lives, the sample is one-sixteenth potassium-40 and fifteen-sixteenths argon-40.

Public Domain

Potassium-40 has a half-life of approximately 1.25 billion years. Approximately how many years will pass before a sample of potassium-40 contains one-sixteenth the original amount of parent isotope?

1.25 billion

2.5 billion

3.75 billion

5 billion

Answer 13

This is now your bible on this stuff,
Tell me if the stickie doesn't work yeah? Or the pdf lol
________

\(\bbox[5pt, #E8F ,border:5px solid #000]{\frak \huge \ Kayla~Princess}\)

Answer 14

-btw sorry for the linda webber name, im using a familys laptop-