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Karim Balasubramanian
Asked: 2022-11-09T16:23:42+05:30 In:

Corbon 14 is used to determine the age of organic material. The procedure is based on the formation of `.^(14)C` by neutron capture in the upper atmosphere.
`._(7) N^(14) +._(0)n^(1) rarr. _(6)C^(14)+._(1)H^(1)`
`.^(14)C` is absorbed by living organisms during photosynthesis. The `.^(14)C ` in the dead being falls due to the decay which `C^(14)` undergoes.
`._(6) C^(14) rarr. _(7)N ^(14) + ._(-1)e^(@)`
The half life period of `^(14)C` is 5770 year. The decay constant `(lambda)` can be calculated by using the following formula `lambda= (0.693)/(t_(t//2))`
The comparison of the `beta^(-)` activity of the dead matter with that of carbon still in circulation enables measurement of the period of hte isolation of the material from the living cycle. The method however, ceases to be accurate over periods longer than 30,000 years. The proportion of `.^(14)C to ._(12)C` in living matter is `1 : 10^(12)`
Which of the following option is correct ?
A. In living organisms, circulation of `.^(14)C` from atmosphere is high so the carbon content is constant in organism
B. Carbon dating can be used to find out the age of earth crust and rocks
C. Radioactive absorption due to cosmic radiation is equal to the rate of radioactive decay, hence the carbon content remains constant in living organism
D. Carbon dating cannot be used to determine concentration of `.^(14)C` in dead beings.

Corbon 14 is used to determine the age of organic material. The procedure is based on the formation of `.^(14)C` by neutron capture in the upper atmosphere.
`._(7) N^(14) +._(0)n^(1) rarr. _(6)C^(14)+._(1)H^(1)`
`.^(14)C` is absorbed by living organisms during photosynthesis. The `.^(14)C ` in the dead being falls due to the decay which `C^(14)` undergoes.
`._(6) C^(14) rarr. _(7)N ^(14) + ._(-1)e^(@)`
The half life period of `^(14)C` is 5770 year. The decay constant `(lambda)` can be calculated by using the following formula `lambda= (0.693)/(t_(t//2))`
The comparison of the `beta^(-)` activity of the dead matter with that of carbon still in circulation enables measurement of the period of hte isolation of the material from the living cycle. The method however, ceases to be accurate over periods longer than 30,000 years. The proportion of `.^(14)C to ._(12)C` in living matter is `1 : 10^(12)`
Which of the following option is correct ?
A. In living organisms, circulation of `.^(14)C` from atmosphere is high so the carbon content is constant in organism
B. Carbon dating can be used to find out the age of earth crust and rocks
C. Radioactive absorption due to cosmic radiation is equal to the rate of radioactive decay, hence the carbon content remains constant in living organism
D. Carbon dating cannot be used to determine concentration of `.^(14)C` in dead beings.
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  1. Correct Answer – C
    In living organism, `.^(14)C` content is constant (not carbon content) as the rate of absorption of `c^(14)` is equal to rate of disintegration of `.^(14)C`.
    Carbon dating can be used to fing out the age of organic materic only .(not for finding the age of earth crust and rocks made of inorganic material)

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Bishnu Borah
Asked: 2022-11-06T12:42:59+05:30 In:

Corbon 14 is used to determine the age of organic material. The procedure is based on the formation of `.^(14)C` by neutron capture in the upper atmosphere.
`._(7) N^(14) +._(0)n^(1) rarr. _(6)C^(14)+._(1)H^(1)`
`.^(14)C` is absorbed by living organisms during photosynthesis. The `.^(14)C ` in the dead being falls due to the decay which `C^(14)` undergoes.
`._(6) C^(14) rarr ._(7)N ^(14) + ._(-1)e^(@)`
The half life period of `.^(14)C` is 5770 year. The decay constant `(lambda)` can be calculated by using the following formula `lambda= (0.693)/(t_(t//2))`
The comparison of the `beta^(-)` activity of the dead matter with that of carbon still in circulation enables measurement of the period of hte isolation of the material from the living cycle. The method however, ceases to be accurate over periods longer than 30,000 years. The proportion of `.^(14)C to ._(12)C` in living matter is `1 : 10^(12)`
What should be the age of fossil for meaningful determination of its age ?
A. 6 years
B. 6000 years
C. 60000 years
D. it can be used to calculate any age

Corbon 14 is used to determine the age of organic material. The procedure is based on the formation of `.^(14)C` by neutron capture in the upper atmosphere.
`._(7) N^(14) +._(0)n^(1) rarr. _(6)C^(14)+._(1)H^(1)`
`.^(14)C` is absorbed by living organisms during photosynthesis. The `.^(14)C ` in the dead being falls due to the decay which `C^(14)` undergoes.
`._(6) C^(14) rarr ._(7)N ^(14) + ._(-1)e^(@)`
The half life period of `.^(14)C` is 5770 year. The decay constant `(lambda)` can be calculated by using the following formula `lambda= (0.693)/(t_(t//2))`
The comparison of the `beta^(-)` activity of the dead matter with that of carbon still in circulation enables measurement of the period of hte isolation of the material from the living cycle. The method however, ceases to be accurate over periods longer than 30,000 years. The proportion of `.^(14)C to ._(12)C` in living matter is `1 : 10^(12)`
What should be the age of fossil for meaningful determination of its age ?
A. 6 years
B. 6000 years
C. 60000 years
D. it can be used to calculate any age
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  1. Correct Answer – B
    As per the information given, the carbon dating method, ceases to be accurate over periods longer than `30,000 ` years. Hence the age of fossil for meaningful determination of its age should not be60000 years or 6 years (as it is quits lesser than `t_(1//2)`) The age of fossil should be near the `t_(1//2) ` of `c^(14)`.i.e. 6000 years.

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