Answer: balloon contains 2600 × 0.1755 = 456.3 kilogram of helium.
Explanation:
Answer:
319 years
Explanation:
For a radioactive decay we have
N = N₀e^-kt , where:
N= Particles Remainng after a time t
N₀ = Particles Initially present
k = ln 2/ t₁/₂ , t₁/₂ is the half life of the radioactive element (Am-241)
We are given that the half-life is 432 yrs, from this inhformation we can calculate the value of k which then will be used to calculate the time Am-241 will take to decay to 40% once we realize we are given the ratio N/N₀.
k = ln 2/ 432 yr = 0.693/ 432 yr = 1.6 x 10⁻³ /yr
N/N₀ = e^-kt
N/N₀ = 60 (amount remaining after 40 % has decayed)/100
N/N₀ = 0.60
0.60 = e-^-kt
taking natural log to both sides of the equation to get rid of e:
ln (0.60) = -1.6 x 10⁻³ /yr x t ∴ t = - ln (0.60) /1.6 x 10⁻³/ yr
t = 0.51 /1.6 x 10⁻³ yr = 319 yrs
To verify our answer realize that what is being asked is how many years it will take to decay 40 %, and we are told the half life , 50 % decay , is 432 years, so for 40 % we will expect it will take less than that which agrees with our resul of 319 years.
The entropy decreases in this system.
Entropy is the measure of change in disorder of the system. The entropy increases with the increase in number of possible states of a system.
Entropy of a system depends upon the temperature. Burning of gasoline produces gases at high temperature, the disorder of the system increases. Therefore, the entropy increases due to the high temperature of the gases produced
Ore is the impure form of the metal; similarly, the gold ore contains gold metal along with the impurities. Hence, due to the impurities in the ore, there is high rate of disorder inthe ore. But the disorder decreases when the gold is separated from the ore as the gold contains lesser impurities than the ore. Therefore, the entropy decreases in this system.
Learn more about entropy here:
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Well its something that is physically happening you could watch it happen and it doesnt require other chemicals for a chemical change.
