7 3Li is 7.016004 u, the atomic mass of 4 2He is 4.002603 u, the atomic mass of a neutron is 1.008665 u, and the atomic mass of the unknown product is 10.012937 u.)
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(b) What is the Q value of the reaction? (The atomic mass of
| 7 |
| 3 |
is 7.016004 u, the atomic mass of
| 4 |
| 2 |
is 4.002603 u, the atomic mass of a neutron is 1.008665 u, and the atomic mass of the unknown product is 10.012937 u.)
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- Calculate the energy released in the reaction, in MeV: 6Li + n = 4He + 3H mLi = 6.015123 u; mn = 1.008665 u; mHe = 4.002603 u; mH = 3.016049 u %3D %3DThe half-life of Ra-226 is 1.60 x 10^3 years = 5.05 x 10^10 s Find k What is the activity in curies of a 1.00 g sample? What is the mass in grams of a Ra-226 sample that has an activity of 1.00 x 10^9 atoms/min?Archeologist extracted 179 gm of carbon from an animal bone from an archeological site. The carbon shows an activity of 15 decays/s. (Half-life of 146C = 5730 years, 1 year = 3.156 x 107 seconds, Avogadro's number = 6.02 x 1023 atoms/mol) (A) Total number of atoms in this carbon sample = . (B) Decay constant of 146C, λ = . (C) Number of 146C atoms in this sample = . (D) Activity of 146C at time (t = 0) = . (E) Age of the animal =
- An unknown element X has the following isotopes: ⁶⁴X (49.00% abundant), ⁶⁶X (28.00% abundant), ⁶⁸X (23.00% abundant). What is the average atomic mass in amu of X?A neutron generator uses an α source, such as radium, tobombard beryllium, inducing the reaction4 He + 9Be → 12C + n . Such neutron sources are called RaBe sources, or PuBe sources if they use plutonium to get the α s. Calculate the energy output of the reaction in MeV.What is the ratio of the radius of 58 Ni to that of 258 Ha ,one of the largest nuclei ever made? Note that the radius of the largest nucleus is still much smaller than the size of an atom.
- (a) For the nuclei B and C, determine the difference in binding energy per nucleon (in MeV). (Let the mass of a proton be 1.0078 u, the mass of a neutron be 1.0087 u, the mass of ¹B be 11.0093 u, and the mass of C be 11.0114 u.) 0.0762 x Review the meaning of the A, Z and N numbers. Review how to find the binding energy of a nucleus and then the binding energy per nucleon. MeV (b) This difference in binding energy is due to which of the following? O Greater electron attraction for the C atom O Greater electron repulsion for the C atom Ⓒ Greater neutron attraction for the C nucleus O Greater neutron repulsion for the ¹C nucleus O Greater proton attraction for the C nucleus Ⓒ Greater proton repulsion for the C nucleusA sample of radioisotope has a decay constant of 9.978✕10-7 s-1 and prepared with an initial activity of 7.5✕1012 s-1. Find the number of atoms in the sample after 10 days.