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Class 12 Physics Modern Physics Nuclei

A pieces of bone an animals from a ruin is found to have

^{14} C

activity of 12 disintegrations per minute per gm of its carbon content. The

^{14} C

activity of of a living animal is 16 disintegration per minute per gm How long ago nearly did the animal die?
(Given half of life

^{14} C

is

t_{1 / 2}

=5760 years)

(a)

1672 years

(b)

2391 years

(c)

3291 years

(d)

4453 years

Correct answer: (b)

Solution:

The initial activity of c -12 is

= A_{0} = 16

dpm.

after a time of t years, activity reduces to A = 12 dpm.

from Radioactivity Law,

A = A_{0} e^{- λ t}

where

λ = \frac{l n _{2}}{T},

T = Half life

\Rightarrow 12 = 16 e^{- λ t}

\Rightarrow t = \frac{T ( - )}{l n _{2}} l n (\frac{1 2}{1 6}) = T l o g_{2} (\frac{3}{4})

So,

t = 5760 l o g_{2} (\frac{4}{3}) ≃ 2390.6 y e a r s .

(Ans)

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solid and semiconductor devices

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The normal activity of living carbon-containing matter is found to be about 15 decays per minute for every gram of carbon. This activity arises from the small proportion of radioactive

_{6}^{14} C

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_{6}^{12} C

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_{6}^{14} C

, and the measured activity, the age of the specimen can be approximately estimated. This is the principle of

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dating used in archaeology. Suppose a specimen from Mohenjodaro gives an activity of 9 decays per minute per gram of carbon. Estimate the approximate age of the Indus-Valley civilisation.

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Why does the radiation C deflect more than A?

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A pieces of bone an animals from a ruin is found to have

^{14} C

activity of 12 disintegrations per minute per gm of its carbon content. The

^{14} C

activity of of a living animal is 16 disintegration per minute per gm How long ago nearly did the animal die?
(Given half of life

^{14} C

t_{1 / 2}

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Name the radiation which is used in carbon dating.

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When charcoal is prepared from a living tree, it shows a disintegration rate of 15.3 disintegration of

^{14} C

per gram per minute. A sample from an ancient piece of charcoal shows .

^{14} C

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A piece of wood from the ruins of an ancient building was found to have a

C^{14}

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disintegration per minute per gram of its carbon content. The

C^{14}

activity of the living wood is

16

disintegration per minute per gram. How long ago did the tree, from which the wooden sample came, di? Given half-life of

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play button image

Carbon dating is used to

play button image

14

dating is used to estimate the age of an archeological specimen.

play button image

The normal activity of living carbon-containing matter is found to be about 15 decays per minute for every gram of carbon. This activity arises from the small proportion of radioactive

_{6}^{14} C

present with the stable carbon isotope

_{6}^{12} C

. When the organism is dead, its interaction with the atmosphere (which maintains the above equilibrium activity) ceases and its activity begins to drop. From the known half-life ( 5730 years) of

_{6}^{14} C

, and the measured activity, the age of the specimen can be approximately estimated. This is the principle of

_{6}^{14} C

dating used in archaeology. Suppose a specimen from Mohenjodaro gives an activity of 9 decays per minute per gram of carbon. Estimate the approximate age of the Indus-Valley civilisation.

play button image

Why does the radiation C deflect more than A?

play button image

A pieces of bone an animals from a ruin is found to have

^{14} C

activity of 12 disintegrations per minute per gm of its carbon content. The

^{14} C

activity of of a living animal is 16 disintegration per minute per gm How long ago nearly did the animal die?
(Given half of life

^{14} C

t_{1 / 2}

play button image

Name the radiation which is used in carbon dating.

play button image

When charcoal is prepared from a living tree, it shows a disintegration rate of 15.3 disintegration of

^{14} C

per gram per minute. A sample from an ancient piece of charcoal shows .

^{14} C

activity to be 12.3 disintegration per gram per minute . how old is this sample? half-life of

^{14} C

play button image

A piece of wood from the ruins of an ancient building was found to have a

C^{14}

12

disintegration per minute per gram of its carbon content. The

C^{14}

activity of the living wood is

16

disintegration per minute per gram. How long ago did the tree, from which the wooden sample came, di? Given half-life of

C^{14}

5760

play button image

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Home
About Us
Blog
Become a Filo
Contact Us

Legal
Privacy Policy and Terms & Conditions
Download App

Copyright FILO EDTECH PVT. LTD. 2021