Could i get some help with this ? Thank you

TOPIC: NUCLEAR PHYSICS

LINKS:

List of radioactive nuclides by half-life - Wikipedia - HALF-LIFES

Atomic Weights and Isotopic Compositions for All Elements (nist.gov) - ATOMIC MASSES

Question 1 The sun generates its energy through nuclear fusion, making helium from hydrogen. The main process by which this happens, called the protonproton chain, goes as follows: - Two protons come together to create deuterium, a positron, a neutrino, and energy: p + p > D + eJr + y + energy a The deuterium fuses with another proton to make 3He: D + p > 3He + energy - Fianlly, 4He is produced by fusing two 3He nuclei together: 3He + 3He > 4He + p + p + energy What is the total energy released during the creation of one 4He nucleus? Give your answer in MeV, and remember that you need to make two 3He nuclei in the process. Be sure to use at least five signicant gures for your masses, but your nal answer should have three orfour sig gs. : Question 2 A radioactive sample at a lab contains a mixture of 223Ra and 470a. There are initially twice as many calcium atoms as there are radium atoms. What is the ratio of calcium atoms to radium atoms 3.00 weeks later? (Note that there are no units in this answer.) Use the following table for halflifes