Answer:
![t = 2.52 billion \:years](https://tex.z-dn.net/?f=t%20%3D%202.52%20billion%20%5C%3Ayears)
Explanation:
As we know by radioactivity law
![N = N_o e^{-\lambda t}](https://tex.z-dn.net/?f=N%20%3D%20N_o%20e%5E%7B-%5Clambda%20t%7D)
so here we will have
![N = 3 mg](https://tex.z-dn.net/?f=N%20%3D%203%20mg)
![N_o = 12 mg](https://tex.z-dn.net/?f=N_o%20%3D%2012%20mg)
now we will have
![3 = 12 e^{-\lambda t}](https://tex.z-dn.net/?f=3%20%3D%2012%20e%5E%7B-%5Clambda%20t%7D)
![\lambda t = ln 4](https://tex.z-dn.net/?f=%5Clambda%20t%20%3D%20ln%204)
now we also know that
![\lambda = \frac{ln2}{1.26 \times 10^6 yrs}](https://tex.z-dn.net/?f=%5Clambda%20%3D%20%5Cfrac%7Bln2%7D%7B1.26%20%5Ctimes%2010%5E6%20yrs%7D)
![t = 1.26\times 10^6\times \frac{ln4}{ln2}](https://tex.z-dn.net/?f=t%20%3D%201.26%5Ctimes%2010%5E6%5Ctimes%20%5Cfrac%7Bln4%7D%7Bln2%7D)
![t = 2.52 billion \:years](https://tex.z-dn.net/?f=t%20%3D%202.52%20billion%20%5C%3Ayears)
Not sure... need help with it
Answer:
D
Explanation:
Because we have two reactants and product
Momentum = (mv).
<span>(2110 x 24) = 50,640kg/m/sec. truck momentum. </span>
<span>Velocity required for car of 1330kg to equal = (50,640/1330), = 38m/sec</span>
The answer should be B, Condense.
Freezing is when a liquid transforms into a solid.
Sublimation is when a solid goes straight to a gas.
Evaporation is when a liquid transforms into a gas.