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kherson [118]
3 years ago
11

Every year a rice farmer collects his crops and burns the soil when he is done once the soil is enriched with debris he replants

his rice unfortunately for the farmer he fell ill and was unable to take care of his fields for over a year in that time he notices that an array of wild plants and animals have moved into his rice lands the landscape has started to look very similar to a neighboring forest
Biology
1 answer:
brilliants [131]3 years ago
5 0

Every year the farmer was taking care of his ice field, keep it clean and clear of all the unnecessary shrubs and then reuse the debris to fertile the soil again and then grow rice again. But since he fell sick, there is no one to take care of his rice field which will leads to the growth of unnecessary plants and weeds in it.

There will grow wild plants and shrubs which will contaminate the rice field.


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When a living organism dies, it stops taking in new carbon. Thus, as the radioactive carbon-14 decays, the ratio of carbon-12 to
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Answer: The fossil is 11459 years old.

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Half-life of carbon-14 = 5700 years

First we have to calculate the rate constant, we use the formula :

k=\frac{0.693}{5700\text{years}}

k=1.21\times 10^{-4}\text{years}^{-1}

Now we have to calculate the age of the sample:

Expression for rate law for first order kinetics is given by:

t=\frac{2.303}{k}\log\frac{a}{a-x}

where,

k = rate constant  = 1.21\times 10^{-4}\text{years}^{-1}
t = age of sample  = ?
a = let initial amount of the reactant  = 100 g
x = amount decayed = 75 g
a - x = amount left after decay process  = 100 - 75 = 25 g  Now put all the given values in above equation, we get
[tex]t==\frac{2.303}{1.21\times 10^{-4}}\log\frac{100}{25}

t=11459years

The fossil is 11459 years old.

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