Answer:
D
Explanation:
Because of the Suns magntism the solar system has been created
Answer:
29.38 seconds
Explanation:
Half life, T = 22.07 s
No = 1293
Let N be the number of atoms left after time t
N = 1293 - 779 = 514
By the use of law of radioactivity
![N=N_{0}e^{-\lambda t}](https://tex.z-dn.net/?f=N%3DN_%7B0%7De%5E%7B-%5Clambda%20t%7D)
Where, λ is the decay constant
λ = 0.6931 / T = 0.6931 / 22.07 = 0.0314 decay per second
so,
![514=1293e^{-0.0314t}](https://tex.z-dn.net/?f=514%3D1293e%5E%7B-0.0314t%7D)
![2.5155=e^{0.0314t}](https://tex.z-dn.net/?f=2.5155%3De%5E%7B0.0314t%7D)
take natural log on both the sides
0.9225 = 0.0314 t
t = 29.38 seconds
atoms of lithium, sodium,
and potassium almost never found alone in nature because t<span>hey have only one electron in their outer most
shell which makes them very reactive and they react with other atoms thats why.
I hope this can help you</span>
a physical change occurs when materials change shape or size but not the molecular composition of the substance