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
Aliun [14]
3 years ago
11

Scientist can determine the age of ancient objects by a method called radiocarbon dating. The bombardment of the upper atmospher

e by cosmic rays converts nitrogen to a radioactive isotope of carbon, 14C, with a half-life of about 5730 years. Vegetation absorbs carbon dioxide through the atmosphere and animal life assimilates 14C through food chains. When a plant or animal dies, it stops replacing its carbon and the amount of 14C begins to decrease through radioactive decay. Therefore, the level of radioactivity must also decay exponentially. A parchment fragment was discovered that had about 68% as much 14C radioactivity as does plant material on Earth today. Estimate the age of the parchment. (Round your answer to the nearest hundred years.)
Chemistry
1 answer:
levacccp [35]3 years ago
3 0

Answer:

  • 28,700 years

1. Data:

a) Half-life: 5730 years

b) Final radioactivity: 68%

2. Solution:

a) <u>Determine the number of half-lives undergone</u>

  • Since, <em>the radioactivity has decreased to 68%, means that the carbon-14 contanined is has been reduced in </em> 32%: 100% - 68% = 32%.

  • 32 = 2⁵, meaning that five half-lives have passed since the <em>plant material</em> that formed the<em> parchment fragment died</em>.

b) <u>Compute the time of five half-lives</u>:

  • 5 × half-life time = 5 × 5730 years = 28,650 years.

c) <u>Round to the nearest hundred:</u>

  • 28,650 years ≈ 28,700 years

And that is <em>the age of the parchment</em>.

You might be interested in
If the male monster has a straight tail, what does his genotype have to be?
Anarel [89]

i think a is the answer                            

8 0
3 years ago
Which statement accurately describes binary star systems?
Yakvenalex [24]

Answer:

The correct answer is D.They have stars that may appear to wobble.

Explanation:

Binary star - Wikipediaen.wikipedia.org › wiki › Binary_star

''Astronomers have discovered some stars that seemingly orbit around an empty space. Astrometric binaries are relatively nearby stars which can be seen to wobble around a point in space, with no visible companion. The same mathematics used for ordinary binaries can be applied to infer the mass of the missing companion''

<em>-Wikipediaen.wikipedia.org › wiki › Binary_star</em>

<em>-Edge 2021</em>

<em>might be a lil late but YW

</em></p>
4 0
3 years ago
Read 2 more answers
What is the approximate ratio of [NO2-] to [HNO2] in order to buffer a solution at pH=4.0?
Strike441 [17]
For the equilibrium that exists in an aqueous solution<span> of nitrous acid (</span>HNO2, a weak acid) ... [H+][NO2. –]. [HNO2<span>]. PAGE: 14.1. 2. Which of the following is a conjugate ... Using the following Ka values, indicate the correct </span>order<span> of base strength. </span>HNO2<span>. Ka = </span>4.0<span> × 10–4 .... Calculate the [H+] in a </span>solution<span>that has a </span>pH<span> of 11.70.
i hope thid works

</span>
6 0
3 years ago
What is technology?
Illusion [34]
The answer to the question is C
7 0
3 years ago
Read 2 more answers
Although xenon and neon are noble gases and therefore do not typically form bonds, weak attractive forces do exist between atoms
mariarad [96]

The statement that best explains why xenon has a higher boiling point than neon is that xenon has more electrons than neon.

<h3>What are intermolecular forces?</h3>

The term intermolecular forces are the force that hold matter together in a particular state such as solid liquid or gas. The more the electrons present, the greater the polarizability and the greater dispersion forces at work.

Thus, the statement that best explains why xenon has a higher boiling point than neon is that xenon has more electrons than neon.

Learn more about intermolecular forces:brainly.com/question/9007693

#SPJ1

5 0
2 years ago
Other questions:
  • 5/10
    7·2 answers
  • Explain the process of preparation of bleaching powder and mention any
    6·2 answers
  • What is The chemistry of living things and living systems created a new
    5·1 answer
  • 1. In class, students learned that a cart will move when a force of 50 N
    11·1 answer
  • Solid potassium chlorate breaks into potassium chloride and oxygen gas when heated up to high temperature. This is an example of
    10·2 answers
  • Calculate the pH of a 0.09 M solution of HBr​
    12·1 answer
  • Rank the following iron-carbon alloys and associated microstructures from the hardest to the softest: __________.
    8·1 answer
  • Read the temp what is it?<br> 17.3 or 17.25??
    8·2 answers
  • POINTS 50 - 30!!! in my bio to find some of my unanswered questions
    8·1 answer
  • In a decomposition reaction involving a gaseous product, what must be done for the reaction to reach equilibrium?
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!