Home
Class 12
CHEMISTRY
A piece of wood from an archaeological s...

A piece of wood from an archaeological sample has 5.0 counts `min^-1`per gram of C-14, while a fresh sample of wood has a count of `15.0 min^-1 gram^-1`. If half life of C-14 Is 5770 years, the age of the archaeological sample is

A

8,500 years

B

9,200 years

C

10,000 years

D

11,000 years

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • ELECTROCHEMISTRY

    PATHFINDER|Exercise QUESTION BANK|54 Videos

Similar Questions

Explore conceptually related problems

In a piece of ancient wood C -14 and C - 12 are present. the ratio of C -14 and C - 12 in this wood at present is 1/8th part of their ratio in the ancient wood. Half life of C^14 is 5570Y. What is the age of the wood?

In a piece of ancient wood C-14 and C-12 in this wood at present is 1/8 part of their ratio in the ancient wood. Half-life of C^14 is 5570 y. What is the age of the wood ?

In the atmosphere, carbon dioxide is found in two forms, i.e., ^12CO_2 and ^14CO_2 . Plants absord CO_2 during photosynthesis in presence of chlorophyll, plants systhesise glucose 6CO_2 +6 H_2O rarr C_6H_12O_6 + 6O_2uarr Half life of ^14CO_2 is 5760 years. The analysis of wooden artifacts for ^14C and ^12C gives useful information for determination of its age. All living organisms, because of their constant exchange of Carbon dioxide with the surroundings have the same ratio of C-14 to C-12, i.e. 1.3xx10^-12 . When an organism dies, the C-14 in it keeps on decaying as follows: 6^14Crarr7^14N+(-1)^0e +Energy Thus, the ratio of C-14 and C-12 decreases with the passage of time. We can measure the proportion of C-14 in the remains of dead organism and determine how long ago it died. The method of carbon dating can be used to date anything made or organic matter, e.g., bone, skeleton, wood, etc. Using carbon dating, materials have been dated to about 50,000 years with accuracy. A piece of wood from an archeological source shows a C-14 activity which is 60% of the activity found in fresh wood today. The age of archeological sample will be:

The half-life of C^(14) is 5760 years . For a 200 mg sample of C^(14) , the time taken to change to 25 mg is -

Wooden artifact and freshly cut tree are having 7.6 and 15.2 counts min-1 ga^(-1) of carbon (t^(1//2) = 5700 "years") respectively. Calculate the age of the artifact.

The half-life of a radioactive isotope X is 50 years . It decays to another element Y which is stable . The two elements X and Y were found to be in the ratio of 1:15 in a sample of a given rock. The age of the rock was estimated to be

A sample of 0.1 g of water at 100^(@)C and normal pressure (1.013 xx 10^(5) N cdot m^(-2)) requires 54 cal of heat energy to convert to steam at 100^(@)C . If the volume of the steam produced is 167.1 cc, the change in internal energy of the sample is

A gas of molar mass 84.5g/mol is enclosed in a flask at 27^(@)C has a pressure of 2 atm. Calculate the density of the gas. [R=0.082 *atm*K^(-1)*mol^(-1) ]

PATHFINDER-CHEMICAL KINETICS-QUESTION BANK
  1. The rate of a certain reaction is given by, rate = k [H^+]^n. The rate...

    Text Solution

    |

  2. The correct statement regarding the following energy diagrams is

    Text Solution

    |

  3. A piece of wood from an archaeological sample has 5.0 counts min^-1per...

    Text Solution

    |

  4. During the emission of a positron from a nucleus, the mass number of t...

    Text Solution

    |

  5. beta emission is always accompanied by

    Text Solution

    |

  6. ""(98)Cf^(246) was formed along with a neutron when an unknown radioac...

    Text Solution

    |

  7. An atomic nucleus having low n/p ratio tries to find stability by

    Text Solution

    |

  8. A plot of 1/T vs Ink for a reaction gives the slope -1xx10^4K. The ene...

    Text Solution

    |

  9. A(g) overset (triangle) to P(q)+Q(g)+R(g), follows first order kinetic...

    Text Solution

    |

  10. The half life period for a first order reaction is .......

    Text Solution

    |

  11. According to Arrhenius equation, the slope of log k vs 1/T plot is

    Text Solution

    |

  12. The value of rate constant for a first order reaction is 2.303 xx 10^-...

    Text Solution

    |

  13. Rate law for the reaction A + B to product is rate= k[A]^2{B]. What is...

    Text Solution

    |

  14. The rate of a reaction doubles when its temperature changes from 300 K...

    Text Solution

    |

  15. The rate of reaction is doubled for every 10^0 rise in temperature. Th...

    Text Solution

    |

  16. The conversion of A to B follows second order kinetics, Doubling the c...

    Text Solution

    |

  17. 75% of a first order reaction is completed in 30 min. What ts the time...

    Text Solution

    |

  18. Order of reaction is decided by

    Text Solution

    |

  19. A chemical reaction was carried out at 300 K and 280 K. The rate const...

    Text Solution

    |

  20. The unit of second order reaction rate constant is

    Text Solution

    |