Question

1. In a particular metal, the K-shell has an energy of -(24.0+A) keV, while the L-shell has an energy of –(2.50+B) keV. Find the wavelength of the K_α (alpha) characteristic x-ray for this metal. Give your answer in picometers (pm) and with 3 significant figures. A:4 B:5

2. Consider an isotope with an atomic number of (2(5+A)) and a mass number of (4(5+A)+2). Using the atomic masses given in the attached table, calculate the binding energy per nucleon for this isotope. Give your answer in MeV/nucleon and with 4 significant figures. A:4

3.A particular radioactive isotope has a half-life of (2.50+A) hours. If you have (24.5+B) g of the isotope at 10:00 AM, how much will you have at 7:30PM? Give your answer in grams (g) and with 3 significant figures. A:4 B:5

4.Consider a pure sample of a radioactive isotope with a mass number of (46+A). If the sample has mass of (25.0+B) micrograms and the isotope has a half-life of (4.50+C)x10⁶ years, determine the decay rate for the sample. Give your answer in decays/second and with 3 significant figures. A:4 B:5 C;11

5.  particular radioactive isotope has a half-life of (16.8+A) years. If the initial amount of the isotope was (24.5+B) g, how years later will the only (3.20+C) g remain of this isotope? Give your answer in years and with 3 significant figures. A:11 B:54 C:4

Answer 1