Could i please get some help with this, thank you !!

Question 'I The sun generates its energy through nuclearfusion, making helium from hydrogen. The main process by which this happens, called the proton-proton chain, goes as follows: . Two protons come together to create deuterium, a positron, a neutrino, and energy: p + p a D + e4r + 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 ve signicant gures for your masses, but your nal answer should have three or four sig gs. : Question 2 A radioactive sample at a lab contains a mixture of 223Ra and 47Ca. There are initially twice as many calcium atoms as there are radium atoms. What is the ratio of calcium atoms to radium atoms 4.50 weeks later? (Note that there are no units in this answer.) Use the following table for halflites