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test 2 study guide

The current through a flashlight bulb is about one

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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 earthquakes is true; P waves are fastest, and L waves cause the most destruction The L wave is ofter the most damaging because; it stays on the surface, so it doesn’t spread out very much An earthquake wave does its worst damage when it reaches an area that; slows it down Landfill is dangerous because; the amplitude of the earthquake increases When there is an atmospheric inversion, sounds tend to; bend downward The ocean sound channel; is very quiet Sound tends to bend toward the side with; colder air The same note is played on two pianos. Beats are heard once per second. From this, we deduce that; at least one of the pianos is out of tune (the notes are at the wrong frequency) We know that the inner part of the Earth is liquid because; no S waves move across it A magnitude 9 earthquake, compared to a magnitude 8 earthquake; has 10 to 30 times the energy You feel the tremors of an earthquake. Ten seconds later, you feel another shaking.
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