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
Vsevolod [243]
3 years ago
6

If an ancient campfire were analyzed, was found to have only about one-eighth the carbon-14 that is normally found in living thi

ngs, how long ago was that campfire extinguished? Answer in units of y.
Physics
1 answer:
devlian [24]3 years ago
5 0

Answer:

17047.54 years or 17048 y

Explanation:

From;

0.693/t1/2 = 2.303/t log (Ao/A)

Where;

t1/2=half-life of the carbon-14 =5670 years

t= time elapsed

Ao= activity of living C-14

A= activity if the sample under study

But A= 1/8 Ao

Hence;

0.693/5670= 2.303/t log(Ao/1/8Ao)

1.22×10^-4 = 2.303/t log 8

1.22×10^-4 = 2.0798/t

t= 2.0798/1.22×10^-4

t= 17047.54 years

You might be interested in
The acceleration of gravity on Earth is approximately 10 m/s2 (more precisely, 9.8 m/s2). If you drop a rock from a tall buildin
mars1129 [50]

Answer:

30 m/s

Explanation:

Velocity is v_{final}=v_{initial}+at since we know that the initial velocity is 0, and the acceleration is 9.8 \frac{m}{s^2} \approx 10 \frac{m}{s^2} then we also know that time is 3 seconds it follows that: v_{final}=v_{initial}+at=0+10\frac{m}{s^2}*3s=30\frac{m}{s}

8 0
4 years ago
Explain why the atomic mass of an element is a weighted-average mass
Sliva [168]
The isotopes contribute to the average atomic mass based on their abundance. The result is that the "average" mass for the atoms of an element is dictated by the most abundant or common isotope. The average atomic mass for carbon is 12.0107 amu. The atomic mass as displayed on the periodic table is a weighted average relative atomic mass of the naturally occuring isotopes of that element. An isotope is an element with the same number of protons but a different number of neutrons For example - Carbon naturally occurs in isotopes C12, C13 and C14 with abundances of 98.9% 1.1% and 'trace' respectively. the average mass is then calculated by 12*98.9%+13*1.1% = 12.01g/mol
3 0
3 years ago
How are temperature, pressure, and volume related dealing with the behavior of a gas
fredd [130]
Pressure and volume of a gas are inversely related. As one goes up, the other goes down, and vice-versa. 
7 0
4 years ago
What energy transformations occur in a tv remote?
Tatiana [17]
Pressing the button: Mechanical to electrical 
<span>Waste energy from this step: Mechanical to heat </span>
<span>Converting electrical signal to IR: electrical to electromagnetic (infrared rays) </span>
<span>Waste energy from this step: electrical to heat </span>
<span>Chemical energy from battery: chemical to electrical</span>
6 0
3 years ago
The block accelerates down the 30 degree incline at 3m/s2. What is the coefficient of friction of these surfaces
dolphi86 [110]
Fnet = Fg sin 30 - Ff
ma = mg sin 30 - mew Fg cos 30
ma = mg sin 30 - mew mg cos 30
a = g sin 30 - mew gcos30
a - g sin 30 = - mew g cos 30
mew = -(a - g sin30)/(g cos 30)
mew = -(3m/s2 - 9.81sin30)/(9.81 cos 30)
mew = 0.22
8 0
3 years ago
Other questions:
  • What mRNA sequence would result from the following DNA sequence?
    5·1 answer
  • A 51-kg woman runs up a vertical flight of stairs in 5.0 s. Her net upward displacement is 5.0 m. Approximately, what average po
    15·1 answer
  • Where are magnetic fields strongest near a bar magnet
    13·2 answers
  • Which factors could be potential sources of error in the experiment? check all that apply.
    11·2 answers
  • 8. The ratio of output power to input power, in percent?A. work. B. efficiency. C. horsepower. D. conductivity.
    10·2 answers
  • All objects ____ energy<br> A) conduct<br> B) insulate <br> C) radiate<br> D) eliminate
    15·2 answers
  • What part of the atom determines physical properties?
    7·1 answer
  • What is the chemical name for N2O3? nitrogen trioxide dinitrogen trioxide pentanitrogenoxide nitrogen oxide
    7·1 answer
  • Learning Check: Ranking Elements
    8·1 answer
  • DUE TOWMOROW HELP
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!