<span>The relation between number of half-lives and the amount of sample that remained is expressed as:
(1/2)^n = x
So, given is 7.
To find x, we will change the equation with 7:
(1/2)^n = x
(1/2)^7 = x
0.5^7 = x
0.0078125 = x
0.0078125 x 100% = x
x = 0.78125
Therefore, 0.78 % of a radioactive species would be created as daughter material after seven half-lives.</span>
Answer:
They differ by their atomic mass and have same proton number.
Explanation:
Isotopes are atoms of the same element with the same proton or atomic number but with different atomic masses.
Answer:
Energy cannot be created or destroyed.
Explanation:
According to the law of conservation of energy, energy can neither be created nor it can be destroyed. Energy can only be transformed from one matter to another. The conservation of energy remains constant in an isolated system. The law is applicable in the system that does not exchange energy in the environment. Energy changes its form but remains constant.
Ncomplete combustion of<span> fossil </span>fuels<span>; forest fires// heavy traffic ... NS: </span>oxidation<span> of H2S </span>gas<span>from </span>decay<span> of </span>organic matter<span> & volcanic activity ... primary pollutant; </span>burning<span> of </span>sulfur containing<span>fossil </span>fuels<span>, </span>coal<span> containing ... HS: </span>combustion of<span> fossil </span>fuel<span>, industrial plants that </span>produce<span> smoke, ash, dust ..... </span>photochemical<span> smog.</span>
