The sun generates its energy through nuclear fusion, 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→D+e++v+ energy The deuterium fuses with another proton to make ³He: D + p³He + 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 significant figures for your masses, but your final answer should have three or four sig figs.

6. The binding energy is the work that must be done to allow an object to escape to infinity. What is the binding energy for an object: a) on the surface of the earth b) in a circular orbit around the earth

Q7) The atomic nucleus uranium-235 has a spin of 2 h Estimate its speed!

210- 84 X (atomic mass = 209.98285 u) undergoes a decay. Assuming all the released energy is in the form of kinetic energy of the a particle (atomic mass = 4.002603 u) and ignoring the recoil of the daughter nucleus (206X1 atomic mass = 205.97444 u), find the speed of the a particle. 82 Ignore relativistic effects. Number Units

Two protons experience a head-on collision moving with velocity v. In order for there to be enough energy to create a new proton- antiproton pair, the velocity of each proton must equal? A) 2c B) 0.866c .914c D) 1.414c

1) For each of the following reactions work out the fastest interaction through which the conservation laws allow it to proceed. Explain your answers. If the reaction is forbidden by all interactions explain why: -+ a. pn++μ+ +μ¯ b. Aºp+e¯ c. μ΄ →e + V d. p+p→y+Y e. Kºn++ π + π° +7° f. π+pAº + Kº g. Aºn+p h. pnº+e+ + ve i. n→p+e+V₂

HS: Physics B [M] (Flex) - Activitie x C Chegg Search + → C A A psja0769-tstemhs-ccl.v3.gradpoint.com/student/27753139/activity/p 6 Atomic Learning 6 Content 360 6 DMAC O DMS (SLO input) 6 Destiny EVAAS 国 Quiz: Directions of the Processes HS: Physics B [M] (Flex) / 3:The Second Law of Thermodynamics 9. Which is an irreversible process? A spoonful of sugar dissolves in a cup of tea. A cup of iced tea is poured from a pitcher. A spoonful of sugar is scooped from a bowl. A spoon is tossed upward. HS: Physics B [M] (..

Part 1: Carbon dating An archaeologist finds some ancient jewelry made from bone. The jewelry has a carbon mass of 387 g (HINT: Assume all the carbon is 12C and determine the number of atoms, 12C has a molar mass of 12 g/mol) and careful measurements show that the remaining 14C has a current decay rate of 20 decays/s. Determine the age of the bone (and presumably the jewelry). The ratio of 14C to 12C when the animal died was 1.25x10-12 & the half-life of 14C is 5730 y. Additionally, 1 mol = 6.022×1023 particles, 1 y = 365.25 days, & 1 day = 24 h. age of bone = Part 2: Rubidium-Strontium dating A geologist finds an old rock and wants to determine its age using rubidium-strontium dating. This is possible because 87Rb, which has a half-life of 4.75×1010 y, undergoes - decay and becomes 87Sr. The geologist determines that the ratio of 87 Sr to 87Rb is 0.033. Assuming there was no 87Sr in the rock when it was formed, determine the age of the rock. age of rock =