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Inessa [10]
3 years ago
12

How many significant figures are present in the following number: 0.0001790497

Chemistry
1 answer:
zzz [600]3 years ago
7 0

Answer:

According to significant figures we have leading zeros, trapped zeros and zeros at the beginning. So that number is a leading zeros and its has 7 SGF.

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More accurate dates of the reigns of ancient Egyptian pharaohs have been determined recently using plants
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<h3>Further explanation</h3>

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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
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