the activity of a sample of carbon has oneeighth of the initial activity. carbon14 has a halflife of 5730 yr. how old is the sample in yr?
100,493 results

college physics part 2
the activity of a sample of carbon has oneeighth of the initial activity. carbon14 has a halflife of 5730 yr. how old is the sample in yr? 
ChemB
The activity of carbon 14 in living tissue is 15.3 disintegrations per minute per gram of carbon. The limit for reliable determination of age is based on carbon 14 is .10 disintegration per min per gram of carbon. Calculate the max age of a sample that can be dated accurately ... 
science
The halflife of carbon 14 is 5730 years. if a 1 g sample of old carbon is 1/8 as radioactive as 1 g of a current sample, then the age of the old sample is about ___________years. 22,900 17,200 11,500 716 
Physicr
A 10 kg sample from a living plant has actiuity 30 000 Bq due to Carbon14. A 500g sample of the same type of plant but dead has activity 1 000 Bq. Calculate the age of the dead sample given that the half life of Carbon14 is 5568 years 
Radioactivity
Beryllium7 has a halflife of 53 D. A sample was observed for one minute and there were 26,880 decays. a.) what is the activity level of the sample? b.) what will the activity level of the sample be after 265 d? c.) after how many days will be activity level of the sample be ... 
nuclear
Calculate the age of a plant sample that shows about oneeighth of the carbon 14 of a living sample. The halflife of carbon14 is about 5760 a. Help please... 
nuclear physics
Calculate the age of a plant sample that shows about oneeighth of the carbon 14 of a living sample. The halflife of carbon 14 is about 5760a How do you do this? 
Chemistry
Carbon14 has a halflife of 5730 y. How much of a 144 g sample of a carbon14 will remain after 1.719 (times) 10 4y? 
Chemistry
Carbon14 has a halflife of 5730 y. How much of a 144 g sample of a carbon14 will remain after 1.719 (times) 10 4y? 
calculus
Carbon14 is a radioactive substance produced in the Earth's atmosphere and then absorbed by plants and animals on the surface of the earth. It has a halflife (the time it takes for half the amount of a sample to decay) of approximately 5730 years. Using this known piece of ... 
halflife
ok so i got... the half life of carbon14 is 5730 years, the relation c+(1/2)^ N/5730 is used to calc. the concentration, c, in parts per trillion remaining n years after death determine the carbon concentration in a 11460 year old bone. please help :) 
halflife
ok so i got... the half life of carbon14 is 5730 years, the relation c+(1/2)^ N/5730 is used to calc. the concentration, c, in parts per trillion remaining n years after death determine the carbon concentration in a 11460 year old bone. please help :) 
chem
Can someone please help me with the following questions? 1:Suppose you were given an ancient wooden box. If you analyze the box for carbon14 activity and find that it is 50% of that of a new piece of wood of the same size, how old is the wood in the box? 2:How old is an ... 
geology
suppose you have a sample of clamshell at a paleoindian site and you measure the 14c activity of aa 100gram sample of carbon as 320 disintegretions per scond (or 3.2 disingtegrations per gram of carbon per second). a. what was the activity(in disitegrations per second) for ... 
chemistry
The halflife for the radioactive decay of calcium47 is 4.5 days.If a sample has an activity of 4.00uCi after 13.5 days, what was the initial activity of the sample? 
chemistry
A wooden object from a prehistoric site has a carbon14 activity of 10 counts per min.(cpm) compared to 40 cpm for new wood. If carbon14 has a half life of 5730 years what is the age of the wood? Please get me started. Thank you 
Chemistry
A piece of wood found in an ancient city has a carbon14 to carbon12 ratio that is oneeighth the carbon14 to carbon12 ratio of a tree growing nearby. How old is the piece of wood? (The halflife of carbon14 is 5,715 years.) 
physics
The halflife of carbon14 is 5730 years. How much of a 50 g sample of carbon14 is present after 11,460 years? 
chemistry
A 1.00g sample of carbon from a modern source gave 15.3 disintegrations per minute. A sample of carbon from an “old” source gave 920 disintegrations per hour. What is the age of the “old” sample of carbon? The halflife of carbon14 is 5.73×103 year. a. about 34,400 ... 
chemistry
A 1.00g sample of carbon from a modern source gave 15.3 disintegrations per minute. A sample of carbon from an “old” source gave 920 disintegrations per hour. What is the age of the “old” sample of carbon? The halflife of carbon14 is 5.73×103 year. a. about 34,400 ... 
Calculus
An artifact was found with 63.8% of Carbon 14, how old is the mummy, assuming the halflife of Carbon 14 is 5730 years. 
science
The halflife of carbon14 is 5730 years. If we start with 10 grams of carbon14, after 5730 years, we will have _____ of carbon14 left. 
science
The halflife of carbon14 is 5730 years. If we start with 10 grams of carbon14, after 5730 years, we will have _____ of carbon14 left. 
Physics
The isotope carbon14, 146C, is radioactive and has a halflife of 5730 years. If you start with a sample of 1000 carbon14 nuclei, how many will still be around in 22920 years? I got 62.5 atoms, am I correct?? Thank you!! 
physics 2
A sample has a activity of 0.0065 Bq per gram of carbon. (a) Find the age of the sample, assuming that the activity per gram of carbon in a living organism has been constant at a value of 0.23 Bq. (b) Evidence suggests that the value of 0.23 Bq might have been as much as 49% ... 
physics
A sample has a activity of 0.0065 Bq per gram of carbon. (a) Find the age of the sample, assuming that the activity per gram of carbon in a living organism has been constant at a value of 0.23 Bq. (b) Evidence suggests that the value of 0.23 Bq might have been as much as 49% ... 
college Geol 101
Suppose you have a sample of clamshell at a Paleoindian site and you measure the 14C activity of a 100gram sample of carbon as 320 disintegrations per minute (or 3.2 disintegrations per gram of carbon per minute). a.What was the activity (in disintegrations per minute) for ... 
Physics
When any radioactive dating method is used, experimental error in the measurement of the sample's activity leads to error in the estimated age. In an application of the radiocarbon dating technique to certain fossils, an activity of 0.15 Bq per gram of carbon is measured to ... 
college geology help please
I was the same person from yesterday. I need help on a question. I don't type very good so I have one of my host family do it for me. so please help us. Suppose you have a sample of clamshell at a Paleoindian site and you measure the 14C activity of a 100gram sample of carbon... 
Physics
University students, studying the activity of a particular radioactive isotope which had a halflife of 12.0 hours. If the original activity of the sample was 448 kBq, what would the activity be 3.00 days later? 
Chemistry  Radioactivity
The activity of a sample of Ba137m has decreased by 75% from its initial activity after 5.10 minutes. What is the halflife of Ba137m? What fraction of activity remains after 6.25 minutes? (A=Aoe (kt); k = .693/t1/2) 
Nuclear Physics
An investigator receives Co60 (5.27 year half life) for use in a research study. Unfortunately the Co60 is contaminated with Cs137 (30.0 year half life). The initial Co60 activity is 400 times the initial Cs137 activity. How long after the initial assay will the Cs137 ... 
Math
A plant fossil lost 40 % of its carbon14. How old is the fossil? (Halflife of carbon14 is 5730 years.) 
math
only 5% of the carbon14 in a small wooden bowl remains , how old is the bowl? Hint, halflife for carbon –14 us 5730 years 
ChemB
measurements of carbon 14 taken from linen wrappings of the book of isaiah from the dead sea scrolls indicate that the scrolls contain 79.5% of the carbon 14 expected in living tissue. how old are these scrolls if the half life of carbon 14 is 5730 years? All radioactive decay... 
physics
How do I do this ? Calculate the age of a plant sample that shows about oneeigth of the carbon 14 of a living sample. The halflife of carbon14 is about 5760a I don't have the notes on how to do this one... Help 
physical science
a scientist found a fossilized bison. using Carbon14 dating, she found that the fossil was about 45,840 years old. Carbon14 has a halflife of 5730 years. how many halflives have passed? 
physics
After 1.84 days, the activity of a sample of an unknown type radioactive material has decreased to 85.8% of the initial activity. What is the halflife of this material? (in days) 
physics
Suppose 32000 radioactive nuclei are in a sample. About how many remain after two days if the halflife is 22 hrs? What is the initial activity of the sample in decays per minute? 
Chemistry
An artifact has a carbon14 to carbon12 ratio that is onefourth the carbon14 to carbon12 ratio of a similar modern object. How old is the artifact? (The halflife of carbon14 is 5,715 years.) 
physics
before 1900 the activity per mass of atmospheric carbon due to the presence of carbon14 averaged about 0.255bq/g of carbon 1. what fraction of carbon is carbon14 
physics
before 1900 the activity per mass of atmospheric carbon due to the presence of carbon14 averaged about 0.255bq/g of carbon 1. what fraction of carbon is carbon14 
Algebra
An artifact was found and tested for its carbon14 content. If 74% of the orginal carbon14 was still present, what is its probable age (to the nearest 100 years)? (Carbon14 has a half life of 5730 years). 
Math
Cosmic ray bombardment of the atmosphere produces neutrons, which in turn react w/ nitrogen to produce radioactive carbon14. Radioactive carbon14 enters all living tissue through carbon dioxide. As long as it is alive, carbon14 is maintained in the organism at a constant ... 
Radioactivity
1. A granite rock is thought to be about 2 billion years old. why is it not possible to determine the age of the Rock using carbon14 dating? 2. A hair sample has 80% of its original carbon14 present. what is the age of the sample? 3. A bone fragment has lost 75% of its ... 
Physics
Carbon15 has a halflife of 5730 years. As observed from Earth, what would the halflife of carbon15 be if it traveled through space at 25% of the speed of light, relative to Earth? 
Calculus
The amount of carbon14 still present in a sample after t years is given by the function where C0 is the initial amount. Estimate the age of a sample of wood discovered by an archeologist if the carbon level in the sample is only 18% of its original carbon14 level. 
Math
The halflife of carbon14, which is used in dating archaeological finds, is 5730 yr. Assume that 100% of the carbon14 is present at time 0 yr, or x=0. Write the equation that expresses the percentage of carbon14 remaining as a function of time. 
Help Please. Math
By comparing the amount of carbon14 to amount of carbon12, one can determine approx how long ago the organism died. The halflife of carbon14 is 5730 years. Assume the initial quantity of carbon14 is 600 milligrams. the equation is A (t)=600*(.5)^(t) (0,600) (1,300) (2,150... 
Pre Calculus
The burial cloth of an Egyptian mummy is estimated to contain 56% of the carbon14 it contained originally. How long ago was the mummy buried? (the halflife of carbon14 is 5730). Please round the answer to the nearest tenth. I have figured that: m(t) = Moe(ln2/5730) is a ... 
chem
A sample of radon has an activity of 80,000 Bq. If the halflife of radon is 15 h, how long before the sample's activity is 5,000 Bq? 
Chem
Living organisms give a Carbon14 decay rate of 15.3 counts/min for each gram of carbon in the sample. A sample of bristle cone pine wood has a decay rate of 3.20 counts/min per gram of carbon. Calculate the age of the wood from the radiochemical evidence. Carbon14 has a half... 
physics
A wooden artifact is found in an ancient tomb. Its carbon14 activity is measured to be 60.0% of that in a fresh sample of wood from the same region. Assuming the same amount of carbon14 was initially present in the wood from which the artifact was made, determine the age of ... 
Biology
The halflife of Carbon14 is 5730 years. What is the age of a fossil containing 1/16 the amount of Carbon14 of living organisms? Explain your calculation. 
chemistry
The halflife of oxygen15 is 124 s. If a sample of oxygen15 has an activity of 4800 Bq, how many minutes will elapse before it has an activity of 600 Bq? 
chem
the half life of oxygen15 is 124 s. if a sample of oxygen15 has an activity of 4000 Bq, how many minutes will elapse before it reaches an activity of 500Bq 
Physics
A radioactive isotope of Bismuth undergoes Beta Decay with a halflife of 22 days. How long (in days) will it take the Activity (A) of the sample to decrease to oneninth of its original value? Assume that the original activity is A0. 
Chemistry
The cloth shroud from around a mummy is found to have a carbon14 activity of 8.1 disintegrations per minute per gram of carbon as compared with living organisms that undergo 15.2 disintegrations per minute per gram of carbon. From the halflife for carbon14 decay, 5715 yr, ... 
Physics
(a)A fossilised tree was tested and contains 10 grams of Carbon14. Given that there was 12 grams of Carbon14 present when it died, determine the age of the fossil? Half life of Carbon14 is 5700 years. (b)How much Carbon14 will be present in the sample 100 years from now? 
Physics
(a)A fossilised tree was tested and contains 10 grams of Carbon14. Given that there was 12 grams of Carbon14 present when it died, determine the age of the fossil? Half life of Carbon14 is 5700 years. (b)How much Carbon14 will be present in the sample 150 years from now? 
Chemistry
What is the activity of a 18.9 μCi sample of carbon14 in becquerels? 
math
1.The remains of an old campﬁre are unearthed and it is found that there is only 80% as much radioactive carbon14 in the charcoal samples from the campﬁre as there is in modern living trees. If the halflife of carbon 14 is 5730 years, how long ago did the camp... 
Chemistry
A sample of sodium24 with an activity of 12 mCi is used to study the rate of blow flow in the circulatory system. If sodium 24 has a halflife of 15 hours, what is the activity of the sodium after 2.5 d ? 
Intermediate Maths
(a)A fossilised tree was tested and contains 10 grams of Carbon14. Given that there was 12 grams of Carbon14 present when it died, determine the age of the fossil? Half life of Carbon14 is 5700 years. (b)How much Carbon14 will be present in the sample 100 years from now? ... 
math
Carbon14 has a halflife of 5730 years. How long will it take 17 grams of carbon14 to be reduced to 10 grams? Round to the nearest integer. 
Chemistry
Radium223 has a halflife of 11.4 days. Approximately how long would it take for the activity of a sample of 223Ra to decrease to 2.00 % of its initial value? 
Chemistry
Radium223 has a halflife of 11.4 days.Approximately how long would it take for the activity of a sample of 223Ra to decrease to 2.00 % of its initial value? 
Final Maths
(a)A fossilised tree was tested and contains 10 grams of Carbon14. Given that there was 12 grams of Carbon14 present when it died, determine the age of the fossil? Half life of Carbon14 is 5700 years. (b)How much Carbon14 will be present in the sample 100 years from now? ... 
PreCalculus
The half life of Carbon14 is 5730 years. a. find the rule of the function that gives the amount remaining from an initial quantity of 100 milligrams of carbon14 after t years. b. the burial cloth of an egyptian mummy i sestimated to contain 59% of the carbon 14 it contained ... 
chemistry
a sample of sodium24 with an activity of 12 mCi is used to study the rate of blood flow in the circulatory system. If sodium24 has a halflife of 15 h, what is the activity of the sodium after 2.5 days. please show work. 
Chemistry Numerical
The half life period of a radioactive element is 27.96 days. Calculate the time taken by a given sample to reduce to 1/8th of its initial activity 
Precalculus
The burial cloth of an Egyptian mummy is estimated to contain 57% of the carbon14 it contained originally. How long ago was the mummy buried? (The halflife of carbon14 is 5730 years.) 
Precalculus
The burial cloth of an Egyptian mummy is estimated to contain 57% of the carbon14 it contained originally. How long ago was the mummy buried? (The halflife of carbon14 is 5730 years.) 
calculus
A wooden artifact recovered from a tomb contains 29% of the carbon14 that is present in living trees. The half life of carbon14 is 5730 years. How long ago was the artifact made? 
physics
If an archaeologist finds an ancient fire pit containing partially consumed firewood and the 14C content of the wood is only 10% of an equal carbon sample from present day tree, what is the age of ancient site. 14 C has half life of 5730 years 
Physics (Inside the atom)
A sample of radioactive isotope I is to be used for medical diagnosis of the kidneys. The isotope has a halflife of 8.0 days, and the sample is required to have an activity of 8 x 10^5 per second at the time it is given to the patient. Calculate the mass of the I131 present ... 
chemistry
The amount of organic carbon in a sample can be obtained by IR analysis of the carbon dioxide (CO2) released following complete combustion of the sample in oxygen. A reference sample of an organic compound is usually used to calibrate the instrument response. In an analysis of... 
math: precalculus
You have 5 grams of carbon14; whose halflife is 5730 years. a)Write the rule of the function that gives the amount of carbon14 remaining after x years. b)How much carbon14 will be left after 4,000 years? c)When will there be just 1 gram left? 
Chemistry
A sample of charcoal is found to have only 1/8th of Carbon14. Halflife of Carbon14 is 5730yrs, what is the age of the charcoal? 
Chemistry
Cobalt60, which undergoes beta decay, has a halflife of 5.26 yr. How many beta particles are emitted in 190s by a 3.10mg sample of Co60? What is the activity of the sample in Bq? 
Chemistry
Cobalt60, which undergoes beta decay, has a halflife of 5.26 yr. How many beta particles are emitted in 190s by a 3.10mg sample of Co60? What is the activity of the sample in Bq? 
Chemistry
Cobalt60, which undergoes beta decay, has a halflife of 5.26 yr. How many beta particles are emitted in 190s by a 3.10mg sample of Co60? What is the activity of the sample in Bq? 
Chemistry
Cobalt60, which undergoes beta decay, has a halflife of 5.26 yr. How many beta particles are emitted in 190s by a 3.10mg sample of Co60? What is the activity of the sample in Bq? 
Biology
The halflife of carbon14 is 5,700 years. If a sample originally had 26 g of carbon14, how much would it contain after 22,800 years? 
College Algebra
Carbon14 Dating. Only 10% of the carbon14 in a samll wooden bowl remains. How old is the bowl? Half life of carbon is 5700 years. 
chem
A typical dose of a radioactive sample is 27.0 mCi. How long does it take for the activity to reduce to 0.100 mCi? The half life of the sample is 211,000 y. 
math
A wooden artifact from an ancient tomb contains 70% of the carbon14 that is present in living trees. How long ago was the artifact made? (The halflife of carbon14 is 5730 years. Round your answer to the nearest whole number.) 
Intro to Astronomy
The halflife of carbon 14, which is commonly used to date organic materials, is 5700 years. What is the minimum age of sample in which less than 1% of the organic carbon 14 is left? 
Nuclear physics
1) An old wooden tool is found to contain only 11.9 percent of 14C that a sample of fresh wood would. How many years old is the tool? 2) A specimen taken from the wrappings of a mummy contains 7.02 g of carbon and has an activity of 1.34 Bq. How old is the mummy? Determine its... 
MATH 123
A wooden artifact from an ancient tomb contains 55% of the carbon14 that is present in living trees. How long ago was the artifact made? (The halflife of carbon14 is 5730 years. Round your answer to the nearest whole number.) 
Nuclear physics Repost
1) An old wooden tool is found to contain only 11.9 percent of 14C that a sample of fresh wood would. How many years old is the tool? 2) A specimen taken from the wrappings of a mummy contains 7.02 g of carbon and has an activity of 1.34 Bq. How old is the mummy? Determine its... 
Chemistry
One last question...even though no one seems to be willing to help me out without being rude. The blood volume in a cancer patient was measured by injecting 5.0 mL of Na2SO4(aq) labeled with 35S (t1/2 = 87.4 d). The activity of the sample was 300 µCi. After 22 min, 12.9 mL of... 
Physics 30
The activity of a sample of a radioactive isotope is 1800Bq. If this isotope has a halflife of 16 days, what is the activity after 16 days?, 24 days?, and 60 days? 
Chemistry
The strontium90 isotope decays by the reaction below. It has a halflife of 28 yr. If the initial activity of this isotope was 168dpm, what would the activity be after 28.0 yr? 
Chem
If you have a 12.01g sample carbon. What would be the average mass of a carbon atoms if it is 1.994 x 10 to the 23 power g. How many carbon atoms are in the sample? 
Chemistry
Radium223 has a halflife of 11.4 days.Approximately how long would it take for the activity of a sample of Radium223 to decrease to 1.00% of its initial value? 
physicsRadioactivity
1) The number of radioactive nuclei in a particular sample decreases over a period of 15 days to oneseventeenth the original number. What is the halflife (in days) of these nuclei? 2) What is the activity of a sample of 14C that contains 1.22E+21 nuclei? 
chemistry
You have a 12.01 g sample of carbon. The average mass of a carbon atoms is 1.994 x 1023 g. How many carbon atoms are in the sample? 
math
In the year 2005, a picture supposedly painted by a famous artist some time after 1815 but before 1865 contains 95 percent of its carbon14 (halflife 5730 years). Approximately how old is the painting? years 
chem
Radioactive substances decay by firstorder kinetics. How many years would be required for a sample containing strontium90 to decrease to 58.32% of its initial activity? The halflife of strontium90 is 2.88e1 years.