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In the atmosphere, carbon dioxide is fou...

In the atmosphere, carbon dioxide is found in two forms, i.e., `.^(12)CO_(2)` and `.^(14)CO_(2)`. Plants absorb `CO_(2)` during photosynthesis. In presence of chlorophyll, plants synthesise glucose.
`6 CO_(2) + 6 H_(2) O to overset(hv)(to) C_(6)H_(12)O_(6) + 6O_(2) uarr`
Half life of `.^(14)C` is 5760 years. The analysis of wooden artifacts for `.^(14)C` and `.^(12)C` gives useful information for deermination of its age. all living organisms, because of their constant exchange of `CO_(2)` with the surrounding have the same ratio of `.^(14)C` to `.^(12)C`, i.e., `1.3 xx 10^(-12)`. When an organism dies, the `.^(14)C` in it keeps on decaying as follows:
`._(6)^(14)C to ._(7)^(14)N + ._(-1)^(0)e` + Energy
Thus, the ratio `.^(14)C//^(12)C` decrease with the passage of time. we can be used to date anything made of organic matter, e.g., bone, skeleton, wood, etc. Using carbon dating material have been dated to about 50,000 years with accuracy.
`.^(14)C` exists in atmosphere due to

A

conversion of `.^(12)C` to `.^(14)C`

B

Combustion of fossil fuel

C

bombardement of atmosphere nitrogen by cosmic ray neutrons

D

none of the above

Text Solution

Verified by Experts

The correct Answer is:
c
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Knowledge Check

  • In the atmosphere, carbon dioxide is found in two forms, i.e., .^(12)CO_(2) and .^(14)CO_(2) . Plants absorb CO_(2) during photosynthesis. In presence of chlorophyll, plants synthesise glucose. 6 CO_(2) + 6 H_(2) O to overset(hv)(to) C_(6)H_(12)O_(6) + 6O_(2) uarr Half life of .^(14)C is 5760 years. The analysis of wooden artifacts for .^(14)C and .^(12)C gives useful information for deermination of its age. all living organisms, because of their constant exchange of CO_(2) with the surrounding have the same ratio of .^(14)C to .^(12)C , i.e., 1.3 xx 10^(-12) . When an organism dies, the .^(14)C in it keeps on decaying as follows: ._(6)^(14)C to ._(7)^(14)N + ._(-1)^(0)e + Energy Thus, the ratio .^(14)C//^(12)C decrease with the passage of time. we can be used to date anything made of organic matter, e.g., bone, skeleton, wood, etc. Using carbon dating material have been dated to about 50,000 years with accuracy. In the process of photosythesis, O_(2) gas is released form:

    A
    `CO_(2)`
    B
    `H_(2)O`
    C
    both `H_(2)O` and `CO_(2)`
    D
    mechanism is not confirmed

  • In the atmosphere, carbon dioxide is found in two forms, i.e., .^(12)CO_(2) and .^(14)CO_(2) . Plants absorb CO_(2) during photosynthesis. In presence of chlorophyll, plants synthesise glucose. 6 CO_(2) + 6 H_(2) O to overset(hv)(to) C_(6)H_(12)O_(6) + 6O_(2) uarr Half life of .^(14)C is 5760 years. The analysis of wooden artifacts for .^(14)C and .^(12)C gives useful information for deermination of its age. all living organisms, because of their constant exchange of CO_(2) with the surrounding have the same ratio of .^(14)C to .^(12)C , i.e., 1.3 xx 10^(-12) . When an organism dies, the .^(14)C in it keeps on decaying as follows: ._(6)^(14)C to ._(7)^(14)N + ._(-1)^(0)e + Energy Thus, the ratio .^(14)C//^(12)C decrease with the passage of time. we can be used to date anything made of organic matter, e.g., bone, skeleton, wood, etc. Using carbon dating material have been dated to about 50,000 years with accuracy. A piece of wood from an archaeological source shows a .^(14)C activity which is 60% of the activity found in fresh wood today. The age of archaeological sample will be:

    A
    4246 yrs
    B
    4624 yrs
    C
    4628 yrs
    D
    6248 yrs

  • In the atmosphere, carbon dioxide is found in two forms, i.e., .^(12)CO_(2) and .^(14)CO_(2) . Plants absorb CO_(2) during photosynthesis. In presence of chlorophyll, plants synthesise glucose. 6 CO_(2) + 6 H_(2) O to overset(hv)(to) C_(6)H_(12)O_(6) + 6O_(2) uarr Half life of .^(14)C is 5760 years. The analysis of wooden artifacts for .^(14)C and .^(12)C gives useful information for deermination of its age. all living organisms, because of their constant exchange of CO_(2) with the surrounding have the same ratio of .^(14)C to .^(12)C , i.e., 1.3 xx 10^(-12) . When an organism dies, the .^(14)C in it keeps on decaying as follows: ._(6)^(14)C to ._(7)^(14)N + ._(-1)^(0)e + Energy Thus, the ratio .^(14)C//^(12)C decrease with the passage of time. we can be used to date anything made of organic matter, e.g., bone, skeleton, wood, etc. Using carbon dating material have been dated to about 50,000 years with accuracy. A wooden piece is 11520 yrs old. What is the fraction of .^(14)C activity left in the piece?

    A
    0.12
    B
    0.25
    C
    0.5
    D
    0.75

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