Answer:
The answer to the question is
50 % of the original amount of potassium 40 will be left after one half life or 1.25 billion years
Explanation:
To solve the question we note that the half life is the time for half of the quantity of substance that undergoes radioactive decay to disintegrate, thus
we have
half life of potassium 40 K₄₀ = 1.25 billion years
To support the believe tht the rock was formed 1.25 billion years ago we have
![N_{(t)} =N_{(0)} (\frac{1}{2}) ^{\frac{t}{t_{\frac{1}{2} } } }](https://tex.z-dn.net/?f=N_%7B%28t%29%7D%20%3DN_%7B%280%29%7D%20%28%5Cfrac%7B1%7D%7B2%7D%29%20%5E%7B%5Cfrac%7Bt%7D%7Bt_%7B%5Cfrac%7B1%7D%7B2%7D%20%7D%20%7D%20%7D)
After 1.25 billion years we have
=
=0.5 of
will be left or 50 % of the original amount of potassium 40 will be left
Answer:
disagree
Explanation:
Cellulose (main component of wood beside lignin) is composed from carbon, hydrogen and oxygen with the following molecular formula (C₆H₁₀O₅)ₓ (where x is the degree of condensation of beta-glucose units which are the basic monosaccharide of the cellulose polysaccharide).
Now when you burn cellulose you obtain carbon (ashes), carbon dioxide (CO₂) and water (H₂O). Of course, beside the main products we may have other by-products but we consider them in very low quantity.
The difference between 3 kg of starting wood and 500 g of ashes is representing the quantity of carbon dioxide (CO₂) and water (H₂O) formed.
We have to say that CO₂ and H₂O are in gaseous state and escape in the atmosphere.
The law of conservation of mass is always valid.
Answer:
A Violet object
Explanation:
An Violet object attracts the heat after white objects, followed by orange, yellow, green, blue, indigo and violet, which attracts the most heat of any visible color other than black.
Answer:it conduct thermal conductivity because of the heat it holds
Explanation: