1. Naturally occuring boron consists of 80.22% 11B (nuclidic mass = 11.009) and 19.78% another isotope. To account for the atomic mass, 10.810, what must be the nuclidic mass of the other isotope?
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- 6. In nature, in a stable state hydrogen has two kinds of isotopes, namely 99.985% 1H with an atomic mass of 1.00783 sma and 0.015% 2H with an atomic mass of 2.01410 sma. The average atomic mass of hydrogen is .... (in sma) a. 1.00150 b. 1.00324 c. 1.00798 d. 1.01528 e. 1.07960 Note : all H have the number 1 below 1H6) A sealed box was found and contained an alloy composed of equal parts by same weight of two metals A and B. These metals are radioactive, with half lives of 12 years and 18 years respectively. When the container was opened, it was found to contained 0.53 kg of metal A and 2.20 kg of metal B. Determine the age of the alloy.4. I have two isotopes A and A' of an element with half-lives T1/2 and Ti/2 respectively. (a) Show that with time, the amount of A' relative to A is NA: (t) f (t) = NA (t) = f (0) exp (2) T' (b) The half-lives of 238U and 235U are 4.5 billion years and 700 million years, respectively. Natural uranium is currently about 97.3% 238U and 0.7% 235U . Based on the formula in (a), how long ago would you have been able to build an atomic bomb out of natural uranium ore, given that "weapons grade" uranium is at least 80% 235U? [MY]
- 4. I have two isotopes A and A' of an element with half-lives T/2 and Ti2 respectively. (a) Show that with time, the amount of A' relative to A is NA (t) f (t) = NA (t) = f (0) exp In (2) ( (b) The half-lives of 238U and 235U are 4.5 billion years and 700 million years, respectively. Natural uranium is currently about 97.3% 238U and 0.7% 235U. Based on the formula in (a), how long ago would you have been able to build an atomic bomb out of natural uranium ore, given that "weapons grade" uranium is at least 80% 235U? [MY]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?I need the answer as soon as possible
- Identify the daughter nuclide, the type of decay (for natural transmutations) and the nuclear reaction3. (07.03 MC) The isotope cobalt-60 has a nuclear mass of 59.933820 u. Calculate the binding energy per nucleon of cobalt-60 using the following information. Mass of Proton: 1.007825 u Mass of Neutron: 1.008665 u 1 u = 931.5 MeV11. Radium-226, 226Ra, undergoes an alpha decay. The current sample of Radium-226 has an initial activity of 5.50 × 101º Bq. (a) Identify the daughter nucleus by name, nucleon number, atomic number and neutron number. (b) What is the decay constant? (c) How many radioactive nuclei were initially present in the sample? (d) How long will it take the sample to reach an activity of 5.00 x 1010 Bq?
- 56 (5) Fe has a mass defect of 0.58872 amu. What is its binding energy per nueleon? 26 (6) For the nuclear reaction 14 4. 17 N. +. He -> H. Calculate the energy in joules associated with the reaction of one atom of nitrogen-14 with one atom of He-4, given that the isotopic masses in amu are: N-14 (14.00307); He-4 (4.00260); O-17 (16.99991); and H-1 (1.007825).3Question 4 Use the following data to calculate the binding energy per nucleon in MeV of the Rhodium-103 nuclide Mass of Rh atom = 102.905503 u 103 45 %3D Mass of proton = 1.007276 u Mass of neutron = 1.008664 u %3D Mass of electron = 0.00054858 u %3D 1u = 931.494 MeV [2.2] Question 5