Lecture 12: Energy Generation in Stars
... Q. Hydrogen burning by fusion reactions occurs in the center of the Sun, because this is the only place where A) There is sufficient hydrogen B) The temperature is low enough and density high enough C) The density is low enough and temperature high enough D) The conditions of high temperature and hi ...
... Q. Hydrogen burning by fusion reactions occurs in the center of the Sun, because this is the only place where A) There is sufficient hydrogen B) The temperature is low enough and density high enough C) The density is low enough and temperature high enough D) The conditions of high temperature and hi ...
Fusion or Fission
... nuclear waste products are created in the process. This is a problem, as many nuclear power plants use fission to produce energy, producing a lot of radioactive byproducts as a result. 4 Conversely, in fusion reactions, the nuclei from atoms with low atomic weights combine to create heavier nuclei. ...
... nuclear waste products are created in the process. This is a problem, as many nuclear power plants use fission to produce energy, producing a lot of radioactive byproducts as a result. 4 Conversely, in fusion reactions, the nuclei from atoms with low atomic weights combine to create heavier nuclei. ...
– 1 – 1. The Physics of Nuclear Reaction Rates 1.1.
... There are four fundamental types of forces in physics. Two act on large scales, gravity and electro-magnetic forces. Gravity is not relevant to nuclear reactions and we ignore it here. The other two act on the scale of the size of atomic nuclei, and have F ∝ (1/r 2)exp(−r/r0 ), where r0 ∼ rnuc . The ...
... There are four fundamental types of forces in physics. Two act on large scales, gravity and electro-magnetic forces. Gravity is not relevant to nuclear reactions and we ignore it here. The other two act on the scale of the size of atomic nuclei, and have F ∝ (1/r 2)exp(−r/r0 ), where r0 ∼ rnuc . The ...
star life cycle
... of nuclear fusion events in a star, they spread across the Universe after supernova explosions . So all the atoms in you have been through a supernova explosion! ...
... of nuclear fusion events in a star, they spread across the Universe after supernova explosions . So all the atoms in you have been through a supernova explosion! ...
Classnotes 9_159 - University of Texas Astronomy
... charge. The proton has one unit of positive charge. The neutron, as its name implies, has no charge. A free (isolated) proton is stable -- experiments have shown that, if it decays, it lives at least 1033 years or so before decaying. A free neutron decays spontaneously in about 11 minutes. A neutro ...
... charge. The proton has one unit of positive charge. The neutron, as its name implies, has no charge. A free (isolated) proton is stable -- experiments have shown that, if it decays, it lives at least 1033 years or so before decaying. A free neutron decays spontaneously in about 11 minutes. A neutro ...
Calculating_Main_Sequence_Lifetimes_StudentGuide
... Since ancient times, the brightness of a star is indicated by "magnitudes": 1, 2 and so on, with dim stars having larger magnitudes. Don’t confuse the relative magnitude with absolute magnitude. The relative magnitude measures the brightness of a star as it appears in the sky and it depends on the b ...
... Since ancient times, the brightness of a star is indicated by "magnitudes": 1, 2 and so on, with dim stars having larger magnitudes. Don’t confuse the relative magnitude with absolute magnitude. The relative magnitude measures the brightness of a star as it appears in the sky and it depends on the b ...
ASTRONOMY: WHAT DO YOU NEED TO KNOW
... it gets hotter because it contracts and converts gravitational energy to heat. This core heats the hydrogen around it, starting fusion, and further heating the outer layers and causing expansion of the entire star. As each layer further out is heated it expands outward thus producing a giant. What i ...
... it gets hotter because it contracts and converts gravitational energy to heat. This core heats the hydrogen around it, starting fusion, and further heating the outer layers and causing expansion of the entire star. As each layer further out is heated it expands outward thus producing a giant. What i ...
Life of stars, formation of elements
... • e- + p Î n • Sudden core collapse: 104 km Î 20 km • Then core rebounds • Outer layers fall in, then get hit by rebounding core. ...
... • e- + p Î n • Sudden core collapse: 104 km Î 20 km • Then core rebounds • Outer layers fall in, then get hit by rebounding core. ...
Type I SuperNova
... Current thinking A – Type 1 Supernova occur only if all of the hydrogen in the outer shells of the companion is transferred to the surface of the dwarf. Helium will then begin to accrete on the surface of the dwarf. Helium requires much higher temperature to fuse, and this higher temperature explosi ...
... Current thinking A – Type 1 Supernova occur only if all of the hydrogen in the outer shells of the companion is transferred to the surface of the dwarf. Helium will then begin to accrete on the surface of the dwarf. Helium requires much higher temperature to fuse, and this higher temperature explosi ...
R - AMUSE code
... ρ(surface)~10-4 kg m-3. Much smaller than mean density ρ(mean)~1.4×103 kg m-3 (which we derived). We know the surface temperature (Teff=5780K) is much smaller than its minimum mean temperature (2×106 K). Thus we make two approximations for the surface boundary conditions: ρM=M, ρ = 0 kg/m3 and T = 0 ...
... ρ(surface)~10-4 kg m-3. Much smaller than mean density ρ(mean)~1.4×103 kg m-3 (which we derived). We know the surface temperature (Teff=5780K) is much smaller than its minimum mean temperature (2×106 K). Thus we make two approximations for the surface boundary conditions: ρM=M, ρ = 0 kg/m3 and T = 0 ...
Quarter 1 Unit 3 Radioactivitypptx
... Not all radioactive isotopes decay in the same way. ◦ Different types of decay change the nucleus in different ways. ...
... Not all radioactive isotopes decay in the same way. ◦ Different types of decay change the nucleus in different ways. ...
Galaxies and Stars Questions KEY
... Galaxies are massive systems, bound by gravity, and consisting of stars and remnants of dead stars; galaxies are an interstellar medium of gas and dust. 2. What are the types or categories for galaxies? There are three major types of galaxies: spiral, irregular, and elliptical. Also, there is a quas ...
... Galaxies are massive systems, bound by gravity, and consisting of stars and remnants of dead stars; galaxies are an interstellar medium of gas and dust. 2. What are the types or categories for galaxies? There are three major types of galaxies: spiral, irregular, and elliptical. Also, there is a quas ...
Ch.21 Stars, Galaxies, and the Universe Section 3: Lives of Stars
... High-mass stars quickly evolve into brilliant supergiants When a supergiant runs out of fuel, it can explode suddenly The supernovas can become part of a nebula This nebula can then contract to form a new, partly recycled star o Neutron Stars: are the remains of high-mass stars They are ev ...
... High-mass stars quickly evolve into brilliant supergiants When a supergiant runs out of fuel, it can explode suddenly The supernovas can become part of a nebula This nebula can then contract to form a new, partly recycled star o Neutron Stars: are the remains of high-mass stars They are ev ...
THE SUN - Halton District School Board
... own gravity is balanced by the nuclear explosions at its core. ...
... own gravity is balanced by the nuclear explosions at its core. ...
P-nuclei
p-Nuclei (p stands for proton-rich) are certain proton-rich, naturally occurring isotopes of some elements between selenium and mercury which cannot be produced in either s- or r-process.