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GSU ASTR 1020 - Homework 2

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3. What is the ultimate source of energy that makes the Sunshine? The internal convective motion, the magnetic field of the Sun is generated by the dynamo processes.5. How is a neutrino different from a neutron? List all the ways you can think of.Neutrons are hadrons as they're made up of quarks and Neutrinos are leptons, Neutrinos have even less mass than a neutrino, A neutron has a very small radius but the neutrino is too small to be measured6. Describe in your own words what is meant by the statement that the Sun is in hydrostatic equilibrium.The Sun has an outward force that is equal to the inward force of gravity for the movement of gases.8. What do measurements of the number of neutrinos emitted by the Sun tell us about conditions deep in the solar interior?The number of neutrinos emitted tells us about the nuclear fission in the solar interior.11. What conditions are required before proton-proton chain fusion can start in the Sun?The condition required before the proton-proton chain fusion can start in the sun is a need for high temperatures and densities to overcome.12. Describe the two main ways that energy travels through the Sun.Convection occurs when the warmer areas of the fluid rise to the colder areas of the fluid. Cooler fluid then takes the place of the warmer fluid which has risen higher. Photons and neutrons in the Sun’s core are carried by radiation. 17. Which of the following transformations is(are) fusion and which is(are) fission: helium to carbon, carbon to iron, uranium to lead, boron to carbon, oxygen to neon? (See Appendix K for a list of the elements.)carbon to iron is a fusionoxygen to neon is a fusionuranium to lead is fissionHelium to carbon is a fusionboron to carbon is fusion23. Give some everyday examples of the transport of heat by convection and by radiation.Boiling water on a stove where the heat from the hotplates is the radiation and the water boiling inside the pot is an example of convection is an everyday example of heat by convection and byradiation.24. Suppose the proton-proton cycle in the Sun were to slow down suddenly and generate energy at only 95% of its current rate. Would an observer on Earth see an immediate decrease in the Sun’s brightness? Would she immediately see a decrease in the number of neutrinos emitted by the Sun?The observer would see a decrease in the number of neutrinos almost immediately; neutrinos take only about 2 seconds to travel from the center of the Sun to its surface and another 8 minutes to reach Earth. An observer on Earth would see a decrease in the brightness of the


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GSU ASTR 1020 - Homework 2

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