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3 years ago

if a layer of sandstone is in contact with a mass of granite that contain small pieces of the Sandstone which rock is older

1 answer:

6 0

The sandstone is older.in order for the granite to have been formed with sandstone in its precnese then it had to have already exsisted in that area..making it older.

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3 years ago

Carbon-14 has a half-life of 5720 years and this is a first order reaction. If a piece of wood has converted 75% of the carbon-1

liraira [26]

Answer: 1145.8 years

Explanation:

Half-life of carbon-14 = 5720 years

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

$k=\frac{0.693}{5720\text{years}}$

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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,

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a = let initial amount of the reactant = 100 g

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a - x = amount left after decay process = 100 - 75 = 25g

Now put all the given values in above equation, we get

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Aleks [24]

Answer:

they are indeed very strong

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4 years ago