The density of aluminum is 2.70 g/cm3. Apiece of aluminum foil that is 1000 cm on each side has a mass of 440. mg. How thick is the piece of foil?
Bombarding sodium-23 with a proton produces nuclide X and a neutron. What is nuclide X? Answers: magnesium-24 magnesium-23neon-23 sodium-24 none of the aboveThe isotope P has a half-life of 14.3 days. If a sample originally contained 1.00 g of P, how much was left after 43 days?Answers: 0.250 g 0.125 g 0.750 g0.500 gIdentify X in the reaction below. U + C → Cf + XAnswers: 1 alpha particle 3 protons 6 neutrons 6 electronsA .20 gram sample of C-14 was allowed to decay for 3 half-lives. What mass of the sample will remain? Carbon-14 has a half life of 5730 years. Answers: 0.025 0.050.1 0.01 0.05The isotope Cu has a half-life of 30 s. If a sample originally contained 48 mg of Cu, how much time passed before the amount fell to 3 mg?Answers: 120 s240s30 s 60 s(when I did my calculation for the question above, I got 60 seconds) What radionuclide decays to Fe-56 by beta emission?Answers: Fe Co Mn Co MnHow do I know wat it becomes. I put 57 Co 27 and it's wrong.The Cf to Cf conversion is accompanied by __________.Answers: an alpha emission a neutron capturean electron capture an electron releaseI would greatly appreciate your help...ASAP. Thank you.
