penquiz/guidance/iRAT must be turned in before the in-class tka 1 (2 pts). Fusio
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penquiz/guidance/iRAT must be turned in before the in-class tka 1 (2 pts). Fusion is roughly the reverse of fission. reverse of fission. Yet both reactions generate huge heat (exothermic). How come? 2 (2 pts). Will al decay nuclear reactions result in decreasing atomic num reactions result in decreasing atomic numbers for products from reactants? 3 (6 pts). A scrap of paper taken from the Dead Sea Scrolls was that found in plants living today. Estimate the age of the scroll. first order rate process; tua(C-14)-5720 yrs organism upto 50000 yrs back found to have a [4C)/[2C] ratio of 0.795 times Given: C-14 and other radioactive decays are process; tuz(C-14) 5720 yrs. This C-14 dating technique can probe fossil -720 rs. This C-14 dating technique can probe fossil of ancient living 4 (6 pts). A meteorite rock is found to contain 35 g non-radioactive Pb-206 and 5 g radioactive U-238 nuclei respectively. This object is believed to have no lead content when it was "borm" and all current Pb were the delay products from U-238. Given the half life of the first-order reaction U-238 Pb-206 decay as 4.5 billion years (4.5x109 yr), how old is this space object? This is called the U-Pb isochron dating method to probe rocks or non-living objects upto billions of years back. difference betwen metelavity Theon, the los in mass shows up as enengy (heat) given off to the mass of an atom and the sum of the masses of its protons, neutrons, s (6 pts), Titd the mas defecet Accoctor 9315 MeVau. A quantae casure of nuclear stability lectrons is called the m tt generates the conversion factor as 931.5 MeV/amu. A quantitative measure of nuclear u nclear bindling enenvesion of mass to energy that occurs during an exothermic nuclear reaction. Given the mass of u 1.007s75 amiu, hns energy for 12C as 7.680 MeVinucleon, respectively, please compute the binding energy for electrons surroundings, AE-(Am)C? that is the nuclear binding energy, which is the energy required to break up a and which is the energy required to break up a nucleus into its com ponent protons and neutrons. This as 1,008665 amu, the mass of electron as zero, the measured mass of s6fe atom of neutron as l proton as as 55.934939 amu and the bind S6Fe and compare it with that for C to decide which binding energy 12C to decide which nuclide are more stable (The greater, the more stable). / neutron, 1 Joule Ikgom/s;Speed of light: 3x10 m/s for uivalents: 1.67493*10kg I l annu=1g/(6022x 1019-1kg/(6.022x equivalents More 10)-Ikg/(6.022x10)-1.6603x10 kg: 1 amu-931.5 MeVExplanation / Answer
(1)
For nuclear fission you need to have a neutron to break the atom, when an atom breaks enormous amount of energy will be released. Where as for fusion, at high temperatures two atoms combine to from one atom where energy is released due to fusion of nucleons inside the nucleous
(2) Decay means decreasing, example alpha, beta and gamma decays, here there will be decrease in the atomic number in the products side but not increase in atomic number.
(3)
k = 0.693 / half life
= 0.693 / 5720 =1.21 x 10-4 / year
ln (0.795 ) = -kt
ln (0.795 ) = -1.21 x 10-4 x t
t =1896 years
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