1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Evgen [1.6K]
3 years ago
7

The radioactive isotope 14C has a half-life of approximately 5715 years. A piece of ancient charcoal contains only 81% as much o

f the radioactive carbon as a piece of modern charcoal. How long ago was the tree burned to make the ancient charcoal
Mathematics
1 answer:
NikAS [45]3 years ago
5 0

Answer:

1758 years

Step-by-step explanation:

0.693/t1/2 = 2.303/t log No/N

t1/2 = half life of the C-14

t= time taken

No= amount of radioactive material originally present

N= amount of isotope after time t.

But N= 0.81 No

0.693/5715= 2.303/t log No/0.81No

0.00012 = 0.211/t

t =0.211 /0.00012

t= 1758 years

You might be interested in
Example 5 suppose that f(0) = −8 and f '(x) ≤ 9 for all values of x. how large can f(3) possibly be? solution we are given that
joja [24]

f'(x) exists and is bounded for all x. We're told that f(0)=-8. Consider the interval [0, 3]. The mean value theorem says that there is some c\in(0,3) such that

f'(c)=\dfrac{f(3)-f(0)}{3-0}

Since f'(x)\le9, we have

\dfrac{f(3)+8}3\le9\implies f(3)\le19

so 19 is the largest possible value.

6 0
3 years ago
HELP PLEASEEEE!!!
Anna35 [415]
B. I mean it’s super easy but I hope it helps
3 0
3 years ago
The number 0.4 can be written as 4/10 so it’s a rational number, true or false
kondaur [170]

Answer:

True

Step-by-step explanation:


6 0
3 years ago
Read 2 more answers
<img src="https://tex.z-dn.net/?f=%20%5Cfrac%7B3%7D%7B4%7D%20%20%7Cm%20-%202n%20%7B%7D%5E%7B2%7D%20%7C%20" id="TexFormula1" titl
dem82 [27]
3/4|-4-2(36)|
3/4|-4-72|
3/4|76|
=57
3 0
3 years ago
For Each coin, state its worth as a percentage of $1?
Ratling [72]

Answer:5. is 500%

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
Other questions:
  • HELP ASAP URGENT
    14·1 answer
  • PLEASE HELP URGENT!!!
    5·1 answer
  • Someone answer for me really need it
    12·1 answer
  • Add parentheses to make the equation true: 6 times 8 - 4 = 24
    14·2 answers
  • To make 1 liter of lemonade, 4 cups of water, 1 cup of lemon juice and 3 tablespoons of sugar are used.
    10·1 answer
  • Which number is equivalent to 4.8 x 10^4in standard form
    15·1 answer
  • (06.02)
    11·2 answers
  • Brianna loves to compete in triathlons. At a race a few months ago, she finished in 360 minutes. At a race yesterday, she took 3
    7·1 answer
  • What is the value of log3 27?
    8·2 answers
  • The bottom part of this block is a rectangle or prism. The top part is a square pyramid. You want cover the block entirely with
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!