The electrified region of the upper atmosphere which impacts radio communication is called the a. thermosphere. b. mesosphere. c. stratosphere. d. ionosphere. 2.
Because its density is so high, neutrons spin in the same way that electrons do so must obey the Pauli Exclusion Principle. 6. A pulsar does not pulse, it emits beams of radiation that sweep around the sky as the neutron star rotates, and astronomers detect pulses when they sweep over the Earth. 11. Sometimes in binary systems, mass flows into a hot accretion disk around the neutron star and causes the emission of x rays.
B. Venus, Saturn, Uranus, and Neptune. C. Earth, Saturn, Neptune, and Venus. *D. Jupiter, Saturn, Uranus, and Neptune. 2. The fragment of an asteroid or any interplanetary material is known as a A. shower material.
INTRODUCTION TO NUCLEAR REACTION: The main features of nuclear reactions include radioactive decay, nuclear fission and nuclear fusion. Radioactive decay: Energy is released in a radioactive decay in the form of the kinetic energy of the particle emitted (α and β), the kinetic energy of the daughter nucleus and the energy of the gamma-ray photon that may accompany the decay. The energy involved may be calculated by finding the mass defect of the reaction. The energy released is the energy equivalent of the mass defect of the reaction. Nuclear fission: Nuclear fission is the process in which a large nucleus breaks into two smaller nuclei that are almost equal in mass.
This whole process is called a nuclear chain reaction. The reactor core generates heat as the kinetic energy is converted to thermal energy. Gamma rays are produced during fission and absorbed by the reactor, where thermal energy is converted to heat. Heat produced by the radioactive decay of fission production remains in the reactor, sometime even if it shut down.
Subatomic Particles and the periodic table 1. The three particles and their properties An atom has no overall charge. The protons (positively charged) and neutrons (no charge) make up the nucleus of an atom, and this is surrounded by negatively charged electrons. There are as many protons as electrons, so they balance each other out, creating a neutral relative charge on the atom. Neutrons, Protons and electrons are all sub-atomic particles.
Charging a Two-Sphere System Using a Positively Charged Object The above examples show how a negatively charged balloon is used to polarize a two-sphere system and ultimately charge the spheres by induction. But what would happen to sphere A and sphere B if a positively charged object was used to first polarize the two-sphere system? How would the outcome be different and how would the electron movement be altered? Consider the graphic below in which a positively charged balloon is brought near Sphere A. The presence of the positive charge induces a mass migration of electrons from sphere B towards (and into) sphere A.
What is the final pressure in the drum if the final temperature is 60oC? A. 0.055 MPa B. 2.0 MPa C. 10 MPa D. 55 MPa Problems 35 and 36 are based on the following statement. Ten kilograms of oxygen and 2 kg of hydrogen are mixed in a 1 m3 vessel.
The number of on any planet can be used to estimate how old the surface is. a. sunspots b. craters c. solar flares d. auroras 18. is only slightly smaller, less massive, and less dense than Earth is. a. Mercury b. Mars c. Venus d.
This principle was first used in a rocket engine by Robert Goddard. Very nearly all modern rocket engines that employ hot gas combustion use de Laval nozzles. Its operation relies on the different properties of gases flowing at subsonic and supersonic speeds [1, 2]. The speed of a subsonic flow of gas will increase if the pipe carrying it narrows because the mass flow rate is constant. The gas flow through a de Laval nozzle is isentropic (gas entropy is nearly constant).