Physics Test 2 Chapters 5 7 Chapter 5 Recent reports discussing the population bomb indicate that the explosion is slowing A one kiloton nuclear weapon exploded at ground level would destroy about 1 square kilometer of a city For an atomic bomb the number of doublings required is closest to 80 An implosion type bomb is required for a Pu 239 bomb Moore s law relates to computer chip capability Which of the following does not represent exponential growth illness from anthrax The statement that the Chernobyl accident will kill 24 000 people is based on the linear hypothesis A moderator is something that slows neutrons The dangerous radioactivity in fallout comes from fission fragments Fallout is much worse if the bomb is exploded near the ground A nuclear reactor cannot explode like a nuclear bomb because the nuclear reactor depends on slow neutrons According to the text the least bad place to put nuclear waste is underground The breeder reactor is designed to produce plutonium The number of nuclear weapons that the United States has was closest to ten thousand PCR has been used to all of the above The Hiroshima bomb used a gun design If the water moderator is lost from the nuclear reactor the chain reaction will increase causing a reactivity accident The material that might be reprocessed from nuclear waste is Pu 239 Which of the following is not a good example of the doubling law future population growth The Canadian Candu reactors use deuterium Plutonium can explode with fewer generation than can uranium because plutonium fission releases more neutrons In a nuclear power plant the material that funs through the turbine is steam The number of deaths from the Nagasaki bomb is estimated to be 50 000 to 100 000 The smallest container that could contain one critical mass of plutonium is a coffee mug The bomb dropped on Hiroshima used as its fuel uranium Saddam Hussein planned to enrich uranium using Calutrons A centrifuge enrichment plant takes an area about one large classroom PCR involves DNA One of the most dangerous radioactive materials from fallout is Sr 90 The term China syndrome refers to meltdown of the nuclear fuel Deleted uranium is a useful substance because an artillery shell made from it is very penetrating PCR was used to learn about descendants of Sally Hemmings Another name for the H bomb is thermonuclear bomb A nuclear explosion similar to the one produced by North Korea would destroy the size of a college campus Cold fusion has been seen in laboratory experiments At Three Mile Island some of the uranium fuel melted What distinguishes a breeder reactor from other reactors is that it makes more fuel than it uses Jupiter is not a star because it isn t massive enough Chapter 6 Current is measured by amps A volt is a measure of energy per electron Magnetism comes from moving electric charge In a permanent magnet the magnetism comes from the spin of the electrons Magnetic monopoles have never been found Rail guns push the projectile using magnetic fields Telsa wanted to use a transformer to distribute electricity because it decreased the current going through long wires to reduce the loss of electricity You can demagnetize a natural magnet by heating it above the Curie point What discovery now allows for headphones to be small and light rare earth magnets such as cobalt Which of the following use or consist of permanent magnets transformers Theoretically the Earth should not have a permanent magnet in its core because its interior is too hot The Earth s magnetism comes from a dynamo in the core The Earth flips it s magnetism on average approximately twice every million years The north geographic pole of the Earth is a south magnetic pole Compasses point north because there are electric currents in the iron core of the Earth Electricity will heat a wire if it has high frequency Static electricity occurs when two surfaces rub against each other and electrons flow from one to another Europe uses higher voltage in homes because it creates less heat in home wiring Lights and TVs in Europe tend to flick because Europe uses 50 Hertz the United States uses 60 Hertz When an object loses some electrons it has a positive charge To get a spark you normally need high voltage A fuse is used in a house to prevent house wires from overheating The Earth s magnetic flips are used for geologic dating In a metal electrons can move freely The aspect of electricity that would make it most dangerous is high current A certain kind of generator uses its own electricity to strengthen its magnetic field Such a generator is called a dynamo The original superconductors were cooled with liquid helium Room temperature superconductors have no practical applications High temperature superconductors operate at approximately 123 C liquid nitrogen temperature We use AC instead of DC because AC can use transformers Topsy was executed with AC to show the dangers of high voltage Edison wanted a power plant on every city block The current through a flashlight bulb is about one amp A stereo speaker produces sound by the force of a magnetic field on an electric charge The light from an ordinary lightbulb comes from the fact that the wire is heated by electricity A Telsa coil is a kind of transformer Submarines can be detected by their magnetism At the Curie temperature magnetism disappears Most electric power is generated by a wire moving through a magnetic field What invention made it possible to change a low voltage AC to a high voltage AC transformer To reduce losses from resistance electric power lines use very high voltage An example of a transformer is a Telsa coil Better motors and earphones have recently been made possible by stronger magnets Chapter 7 Beats measure the difference between two frequencies Waves tend to bend in to the side with slower wave velocity The fastest earthquake wake is the P wave The slowest earthquake is the L wave An octave refers to two frequencies that differ by a factor of 2 When two different waves pass through an opening of the same size which one will spread more larger wavelength The fastest sound wave is they all travel that same speed You can measure the distance to the epicenter by measuring the time between P and S waves Sound travels fastest in rock When an opening gets smaller a wave that passes through it spreads more The very center of the Earth is solid iron Which kind of earthquake wave is purely longitudinal P wave Which of the following statements about
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