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- MASS OF A PROTON: 1.007825 U; MASS OF A NEUTRON: 1.008665 U 7. If we start with 8 million nuclei of a radioisotope with a half-life of 5 minutes. How many nuclei will be remaining in 50 min? 8. What are Fermions? Identify 3 different aspects and give an example. 9. ( What is the difference between a particle and its antiparticle? What is the antiparticle of electron? 11. Did the universe have a beginning? Explain. 2. What element did the early Universe contain?YThe Feynman diagram at right shows a particle interaction mediated by which force? (Time is the vertical axis.) B. weak nuclear A. strong nuclear C. electromagnetic E. all of the above D. gravitational
- Directions: Briefly describe the illustrations by citing scientific explanation based on the wave particle duality theory. 1.More than 60 years ago, future Nobel laureate Sheldon Glashow predicted that if an antineutrino — the antimatter answer to the nearly massless neutrino — collided with an electron, it could produce a cascade of other particles. The Glashow resonance phenomenon is hard to detect, in large part because the antineutrino needs about 1,000 times more energy than what's produced in the most powerful colliders on Earth. 1. What is the threshold antineutrino energy for the Glashow resonance in peta electronvolts (PeV)? 2. What is this threshold energy in units of joules? 3.Now consider a baseball with the same kinetic energy as that of the Glashow resonance. What speed in m/s would correspond to this energy? 4.What is this rate in units of inches/second?What is wave particle duality. Please explain in details.
- Choose the correct statements from the following list. (Give ALL correct answers, i.e., B, AC, BCD...) A) The inflationary model of the universe solves both the flatness and the horizon problems. B) The critical density is the density needed to cause the Big Bang. C) The horizon problem in cosmology is that regions of the universe that should not have ever had thermal contact with one another have the same temperature. D) A major difference between dark matter and dark energy is that one causes the univserse's expansion to slow down, the other to make it expand faster. E) Observations show us that the geometry of our universe must be very close to flat. F) Assuming no dark energy, if the matter density of the universe is less than critical, the universe is closed. G) Assuming no dark energy, if the matter density of the universe is greater than critical, the universe is will expand forever.Why does primordial nuclesythesis end about 3 minutes after the Big Bang ? select one : a. The number densities of photons is too large at this time and the photons induce fission , stopping nuclei formation b. The universe is tooo hot at t=3 minutes c. The number densities of neutrons and protons and other nuclei are too small at this time and fusion fades out . d. Deuterium has a lifetime of 3 minutes , so after this time no more deuterium survives as it decays away ?Problem 2. The redshift is defined to be the quantity Job – Xem Xem where Aob and Aem are respectively the wavelengths at which radiation is observed and emitted. 1. Find the corresponding definition in terms of observed and emitted frequencies fob and fem. 2. The observed frequency of radio waves from a distant galaxy is 5 GHz. At the location of galaxy, the frequency is 6 GHz. Calculate the redshift of the galaxy. 3. If the galaxy was 500 Mpc away from the Milky way when the radio waves were emitted. How far away is this galaxy today?
- Р3. Consider the CSP problem below. Using Arc-consistency will there be a guaranteed solution? Explain A {T,F} AB {T,F} B C {T,F} B.4. Draw one tree-level, lowest-order Feynman diagram corresponding to the dominant force for each of the following Standard Model processes. Use only fundamental particles, label them, and clearly indicate which particles are in the initial state and which are in the final state. Show all spectator quarks. NB the notation X(919293) indicates that a hadron 'X' is composed of valence quarks with flavours 9₁, 92 and 93 respectively. 1. 7+ + 7¯ → et + e¯ (at a centre of mass energy of 90 GeV) T 2. et +eV, +, (at a centre of mass energy of 5 GeV) 3. A+(uud) →n + π (ud) 4. +(uus)p+nºPhysics solve all part please. More than 60 years ago, future Nobel laureate Sheldon Glashow predicted that if an antineutrino — the antimatter answer to the nearly massless neutrino — collided with an electron, it could produce a cascade of other particles. The Glashow resonance phenomenon is hard to detect, in large part because the antineutrino needs about 1,000 times more energy than what's produced in the most powerful colliders on Earth. Let's compare this event to an ordinary baseball with a mass of 146 g. Please use three significant figures in your calculations. 1. What is the threshold antineutrino energy for the Glashow resonance in peta electronvolts (PeV)? Answer 6.3 2. What is this threshold energy in units of joules? Answer 0.001 Joules 3. Now consider a baseball with the same kinetic energy as that of the Glashow resonance. What speed in m/s would correspond to this energy? 4. What is this rate in units of inches/second?