Carbon-14 is a radioactive isotope that can decay. This isotope can be used to determine how long ago an organism died by knowing the ratio from 12C to 14C

Can be formulated

$\tt Nt=No\dfrac{1}{2}^{t/t1/2}$

Or we can use :

$t=-\frac{1}{\lambda }\text{ln}\left(\frac{{N}_{t}}{{N}_{0}}\right)\longrightarrow t=-\frac{1}{\lambda }\text{ln}\left(\frac{{\text{Rate}}_{t}}{{\text{Rate}}_{0}}\right)$

The half-life of C-14, 5730 years, so the decay constant :

$\tt \lambda =\dfrac{\text{ln 2}}{{t}_{1\text{/}2}}=\dfrac{0.693}{\text{5730 y}}=1.21\times {10}^{-4}}$

Assume the initial C-14 activity was 13.6 disintegrations/min/g of C

$\tt t=-\dfrac{1}{\lambda }\text{ln}\left(\dfrac{{\text{Rate}}_{t}}{{\text{Rate}}_{0}}\right)=-\dfrac{1}{1.21\times {10}^{-4}}\text{ln}\left(\dfrac{9.07}{13.6}\right)=\text{3348}\approx 3350~y$

7 0

3 years ago

What will happen to the wavelength of a wave if the frequency is left unchanged?

algol [13]

Someone. or something will get hurt

6 0

3 years ago

What is the empirical formula of the mineral Co+Fe+As

dlinn [17]

Answer:

(Co,Fe)As2

Explanation:

The formula of the mineral safflorite, a compound made of cobalt, iron, and arsenic is (Co,Fe)As2. This itself is the imperical formula, it cannot be divided any further

6 0

3 years ago

The theory of continental drift was widely unaccepted until scientists started using ________ the map the ocean floor.

Bumek [7]

Answer:

B. SONAR (Sound Navigation Ranging)

Explanation:

Just took the test

4 0

4 years ago

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