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2 years ago

Can anyone help with this question? Much love if can!!

Biology

1 answer:

OverLord2011 [107]2 years ago

5 0

-I would say for the "consumption is less now compared to 1970" is :
cheese, eggs, milk, added fats, poultry
- and for the "consumption is more than now compared to 1970" is :
total calories, refined grains and cereals, red meat, added sugar (such as a candy bar a day),
fish

this is based on what I know so sorry if I'm wrong :( (if I am then feel free to report my answer!)

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Answer: 100 grams of the parent isotope will remain after one half life.

Explanation:

Mass of the isotope present at initial stage = $N_o=200 g$

The mass of the parent isotope left after the time ,t=N

Time taken by the samle ,t = $t_{\frac{1}{2}}$

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$N=N_o\times e^{-\lambda t}$

$\lambda =\frac{0.693}{t_{\frac{1}{2}}}$

$\ln[N]=ln[N^o]-\frac{0.693}{t_{\frac{1}{2}}}\times t_{\frac{1}{2}}$

$2=\frac{[N_o]}{[N]}$

$[N]=\frac{N_o}{2}=\frac{200 g}{2}=100 g$

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