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yanalaym [24]
3 years ago
8

Which of the following is an adaptation found in many desert plants?

Geography
1 answer:
Dafna11 [192]3 years ago
5 0
A. dormant period during winter
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A rock is radiometrically dated to determine its age. The laboratory doing the dating discovers that the rock currently has 200
Soloha48 [4]

Answer: The rock is 2000785 years old.

Explanation:

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

t = age of sample

a = initial amount of the reactant  = 800

x = amount of daughter isotope = 600

a - x = amount left after decay process = amount of parent isotope = (800-600) = 200

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

t_{\frac{1}{2}}=\frac{0.693}{k}

k=\frac{0.693}{1000000}=0.000000693years^{-1}

t=\frac{2.303}{0.000000693}\log\frac{800}{200}

t=2000785years

The rock is 2000785 years old.

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