Find the number of carbon atoms in the sample

Reference no: EM13328635

A living specimen in equilibrium with the atmosphere contains one atom of 14C (half-life = 5 730 yr) for every 7.70 1011 stable carbon atoms. An archeological sample of wood (cellulose, C12H22O11) contains 22.4 mg of carbon. When the sample is placed inside a shielded beta counter with 88.0% counting efficiency, 839 counts are accumulated in one week. We wish to find the age of the sample.

(a) Find the number of carbon atoms in the sample.

(b) Find the number of carbon-14 atoms in the sample.

s?1

(d) Find the initial number of decays per week just after the specimen died.

decays/week

(e) Find the corrected number of decays per week from the current sample.

decays/week

(f) From the answers to parts (d) and (e), find the time interval in years since the specimen died.

Reference no: EM13328635

Questions Cloud

Calculate the firms u.s. federal corporate tax : If a firm has revenues of $15,090 and expenses of $8,850, what is the firm's taxable income - calculate the firm's U.S. federal corporate tax

By how much is the column compressed : A 4.4-m-tall, 30-cm-diameter concrete column supports a 5.0×105kg load. By how much is the column compressed

Compute the speed the child will have at the bottom of arc : A 70- kg child sits in a swing suspended with 3.3- m-long ropes. determine the speed the child will have at the bottom of the arc

Select a game that can be mapped by an automata : Select a game that can be mapped by an automata. This means the game will have a finite set of states (for whichcertain conditions are true) and an exit condition.

Find the number of carbon atoms in the sample : A living specimen in equilibrium with the atmosphere contains one atom of 14C (half-life = 5 730 yr) for every 7.70 1011 stable carbon atoms. Find the number of carbon atoms in the sample

Explain the precipitate is incompletely soluble : An unknown solution forms a white precipitate when treated with 6 M HCL. The precipitate is incompletely soluble in hot water but dissolves completely in NH3. What ion(s) are definitely present

Explain how much energy is emitted when electron : How much energy is emitted when electron in hydrogen atom undergoes a transition from n=5 to n=2 level. what is the wavelength of this emission. what is the frequency

Find the decay constant per second : A freshly prepared sample of a certain radio isotope has a duty cycle of 11.6 mCi. After 3.6 hours, its activity is 8.00 mCi. Find the decay constant per second

Explain what ph will an aqueous solution : At what pH will an aqueous solution of 0.200 M Ni^2+ begin to precipitate as Ni(OH)2 at 25 degrees C? Ksp of Ni(OH)2 is 5.5 x 10^-16 at 25 degrees C.

User Account

All Pages