var presentation = ["<word>circular water puddle<\/word>","<word>periodically<\/word>","<word>produce disturbances<\/word>","<word>point<\/word>","<word>concentric circles<\/word>","<word>same frequency<\/word>","<word>approaching<\/word>","<phrase>Suppose that there is a happy bug in the center of a <strong data-readahead=\"circular water puddle\" class=\"presentation_word\">circular water puddle<\/strong>. The bug is <strong data-readahead=\"periodically\" class=\"presentation_word\">periodically<\/strong> shaking its legs in order to <strong data-readahead=\"produce disturbances\" class=\"presentation_word\">produce disturbances<\/strong> that travel through the water. If these disturbances originate at a <strong data-readahead=\"point\" class=\"presentation_word\">point<\/strong>, then they would travel outward from that <strong data-readahead=\"point\">point<\/strong> in all directions. Since each disturbance is traveling in the same medium, they would all travel in every direction at the same speed. The pattern produced by the bug's shaking would be a series of <strong data-readahead=\"concentric circles\" class=\"presentation_word\">concentric circles<\/strong> as shown in the diagram at the right. These circles would reach the edges of the water puddle at the <strong data-readahead=\"same frequency\" class=\"presentation_word\">same frequency<\/strong>. An observer at <strong data-readahead=\"point\">point<\/strong> A (the left edge of the puddle) would observe the disturbances to strike the puddle's edge at the <strong data-readahead=\"same frequency\">same frequency<\/strong> that would be observed by an observer at <strong data-readahead=\"point\">point<\/strong> B (at the right edge of the puddle). In fact, the frequency at which disturbances reach the edge of the puddle would be the same as the frequency at which the bug produces the disturbances. If the bug produces disturbances at a frequency of 2 per second, then each observer would observe them <strong data-readahead=\"approaching\" class=\"presentation_word\">approaching<\/strong> at a frequency of 2 per second.<\/phrase>","<word>moving to the right<\/word>","<word>same frequency<\/word>","<word>closer to observer B<\/word>","<word>farther from observer A<\/word>","<word>shorter distance<\/word>","<word>less time<\/word>","<word>higher<\/word>","<word>further distance<\/word>","<word>less<\/word>","<word>This effect is known as the Doppler effect<\/word>","<phrase>Now suppose that our bug is <strong data-readahead=\"moving to the right\" class=\"presentation_word\">moving to the right<\/strong> across the puddle of water and producing disturbances at the <strong data-readahead=\"same frequency\" class=\"presentation_word\">same frequency<\/strong> of 2 disturbances per second. Since the bug is moving towards the right, each consecutive disturbance originates from a position that is <strong data-readahead=\"closer to observer B\" class=\"presentation_word\">closer to observer B<\/strong> and <strong data-readahead=\"farther from observer A\" class=\"presentation_word\">farther from observer A<\/strong>. Subsequently, each consecutive disturbance has a <strong data-readahead=\"shorter distance\" class=\"presentation_word\">shorter distance<\/strong> to travel before reaching observer B and thus takes <strong data-readahead=\"less time\" class=\"presentation_word\">less time<\/strong> to reach observer B. Thus, observer B observes that the frequency of arrival of the disturbances is <strong data-readahead=\"higher\" class=\"presentation_word\">higher<\/strong> than the frequency at which disturbances are produced. On the other hand, each consecutive disturbance has a <strong data-readahead=\"further distance\" class=\"presentation_word\">further distance<\/strong> to travel before reaching observer A. For this reason, observer A observes a frequency of arrival that is <strong data-readahead=\"less\" class=\"presentation_word\">less<\/strong> than the frequency at which the disturbances are produced. The net effect of the motion of the bug (the source of waves) is that the observer towards whom the bug is moving observes a frequency that is <strong data-readahead=\"higher\">higher<\/strong> than 2 disturbances\/second; and the observer away from whom the bug is moving observes a frequency that is <strong data-readahead=\"less\">less<\/strong> than 2 disturbances\/second. <strong data-readahead=\"This effect is known as the Doppler effect\" class=\"presentation_word\">This effect is known as the Doppler effect<\/strong>.<\/phrase>","<word>whenever the source of waves is moving<\/word>","<word>moving source<\/word>","<word>apparent upward shift<\/word>","<word>approaching<\/word>","<word>apparent downward shift<\/word>","<word>receding<\/word>","<word>does not result<\/word>","<word>actual change in the frequency<\/word>","<word>appears<\/word>","<word>only observed<\/word>","<word>distance<\/word>","<word>decreasing<\/word>","<word>increasing<\/word>","<phrase>The Doppler effect is observed <strong data-readahead=\"whenever the source of waves is moving\" class=\"presentation_word\">whenever the source of waves is moving<\/strong> with respect to an observer. The Doppler effect can be described as the effect produced by a <strong data-readahead=\"moving source\" class=\"presentation_word\">moving source<\/strong> of waves in which there is an <strong data-readahead=\"apparent upward shift\" class=\"presentation_word\">apparent upward shift<\/strong> in frequency for observers towards whom the source is <strong data-readahead=\"approaching\" class=\"presentation_word\">approaching<\/strong> and an <strong data-readahead=\"apparent downward shift\" class=\"presentation_word\">apparent downward shift<\/strong> in frequency for observers from whom the source is <strong data-readahead=\"receding\" class=\"presentation_word\">receding<\/strong>. It is important to note that the effect <strong data-readahead=\"does not result\" class=\"presentation_word\">does not result<\/strong> because of an <strong data-readahead=\"actual change in the frequency\" class=\"presentation_word\">actual change in the frequency<\/strong> of the source. Using the example above, the bug is still producing disturbances at a rate of 2 disturbances per second; it just <strong data-readahead=\"appears\" class=\"presentation_word\">appears<\/strong> to the observer whom the bug is <strong data-readahead=\"approaching\">approaching<\/strong> that the disturbances are being produced at a frequency greater than 2 disturbances\/second. The effect is <strong data-readahead=\"only observed\" class=\"presentation_word\">only observed<\/strong> because the <strong data-readahead=\"distance\" class=\"presentation_word\">distance<\/strong> between observer B and the bug is <strong data-readahead=\"decreasing\" class=\"presentation_word\">decreasing<\/strong> and the <strong data-readahead=\"distance\">distance<\/strong> between observer A and the bug is <strong data-readahead=\"increasing\" class=\"presentation_word\">increasing<\/strong>.<\/phrase>","<word>any type of wave<\/word>","<word>towards you<\/word>","<word>approached<\/word>","<word>pitch<\/word>","<word>high<\/word>","<word>suddenly<\/word>","<word>passed<\/word>","<word>low<\/word>","<word>apparent shift in frequency<\/word>","<word>moving source<\/word>","<phrase>The Doppler effect can be observed for <strong data-readahead=\"any type of wave\" class=\"presentation_word\">any type of wave<\/strong> - water wave, sound wave, light wave, etc. We are most familiar with the Doppler effect because of our experiences with sound waves. Perhaps you recall an instance in which a police car or emergency vehicle was traveling <strong data-readahead=\"towards you\" class=\"presentation_word\">towards you<\/strong> on the highway. As the car <strong data-readahead=\"approached\" class=\"presentation_word\">approached<\/strong> with its siren blasting, the <strong data-readahead=\"pitch\" class=\"presentation_word\">pitch<\/strong> of the siren sound (a measure of the siren's frequency) was <strong data-readahead=\"high\" class=\"presentation_word\">high<\/strong>; and then <strong data-readahead=\"suddenly\" class=\"presentation_word\">suddenly<\/strong> after the car <strong data-readahead=\"passed\" class=\"presentation_word\">passed<\/strong> by, the <strong data-readahead=\"pitch\">pitch<\/strong> of the siren sound was <strong data-readahead=\"low\" class=\"presentation_word\">low<\/strong>. That was the Doppler effect - an <strong data-readahead=\"apparent shift in frequency\" class=\"presentation_word\">apparent shift in frequency<\/strong> for a sound wave produced by a <strong data-readahead=\"moving source\" class=\"presentation_word\">moving source<\/strong>.<\/phrase>","<word>shift in frequency<\/word>","<word>moving stars<\/word>","<word>derive information<\/word>","<word>universe is expanding<\/word>","<word>observations<\/word>","<word>waves emitted by stars<\/word>","<word>information about stars<\/word>","<word>determined by application of the Doppler effect<\/word>","<word>rotate<\/word>","<word>point<\/word>","<word>shifted downward<\/word>","<word>redshift<\/word>","<word>away from the Earth<\/word>","<word>blueshift<\/word>","<word>towards the Earth<\/word>","<phrase>The Doppler effect is of intense interest to astronomers who use the information about the <strong data-readahead=\"shift in frequency\" class=\"presentation_word\">shift in frequency<\/strong> of electromagnetic waves produced by <strong data-readahead=\"moving stars\" class=\"presentation_word\">moving stars<\/strong> in our galaxy and beyond in order to <strong data-readahead=\"derive information\" class=\"presentation_word\">derive information<\/strong> about those stars and galaxies. The belief that the <strong data-readahead=\"universe is expanding\" class=\"presentation_word\">universe is expanding<\/strong> is based in part upon <strong data-readahead=\"observations\" class=\"presentation_word\">observations<\/strong> of electromagnetic <strong data-readahead=\"waves emitted by stars\" class=\"presentation_word\">waves emitted by stars<\/strong> in distant galaxies. Furthermore, specific <strong data-readahead=\"information about stars\" class=\"presentation_word\">information about stars<\/strong> within galaxies can be <strong data-readahead=\"determined by application of the Doppler effect\" class=\"presentation_word\">determined by application of the Doppler effect<\/strong>. Galaxies are clusters of stars that typically <strong data-readahead=\"rotate\" class=\"presentation_word\">rotate<\/strong> about some center of mass <strong data-readahead=\"point\" class=\"presentation_word\">point<\/strong>. Electromagnetic radiation emitted by such stars in a distant galaxy would appear to be <strong data-readahead=\"shifted downward\" class=\"presentation_word\">shifted downward<\/strong> in frequency (a <strong data-readahead=\"redshift\" class=\"presentation_word\">redshift<\/strong>) if the star is rotating in its cluster in a direction that is <strong data-readahead=\"away from the Earth\" class=\"presentation_word\">away from the Earth<\/strong>. On the other hand, there is an upward <strong data-readahead=\"shift in frequency\">shift in frequency<\/strong> (a <strong data-readahead=\"blueshift\" class=\"presentation_word\">blueshift<\/strong>) of such observed radiation if the star is rotating in a direction that is <strong data-readahead=\"towards the Earth\" class=\"presentation_word\">towards the Earth<\/strong>.<\/phrase>"];
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