Answer:
explanation below
Explanation:
Dichlorodiphenyltrichloroethane, also known as DDT is a chemical compound that is found in insecticides. In 1972, the United States Environmental Protection Agency issued an order for the cancellation of requests for the chemical compound because it affects wildlife and pose risks to humans as well.
From the question here, it was noted that the initial concentration was 22ppm 25years ago and so if it takes 7years to decay by half, the actual concentration in present day farmers could be calculated as follows;
25years ago - 22ppm
18years ago - 11ppm
11years ago – 5.5 ppm
4 years ago - 2.75ppm
Since 7yrs = 0.5
Then 4yrs will be [ [4/7] x 0.5] = 0.2857
Then if 0.5 = 2,
Then 0.2857 = [ [ 0.2857/0.5] x 2] = 1.1428
So present year concentration would then be [2.75ppm/1.1428] = 2.406ppm
<u>Answer:</u> The other isotope is
<u>Explanation:</u>
Beta decay is defined as the decay process in which a neutron gets converted to a proton and an electron.
In this decay process, beta particle is emitted. The emitted particle carries a charge of -1 units and has a mass of 0 units. The released beta particle is also known as electron.
The general equation for the beta decay process follows:
The chemical equation for the beta decay of an isotope that produces Sr-87 isotope follows:
The isotope that undergoes beta decay to form Strontium-87 isotope is Rubidium-87
Hence, the other isotope is
Answer:
375
Explanation:
325 + 50 = 375
just add them together and you get 375