document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1181800>Question 1181800</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Could you please show me the steps how to solve this problem?<BR>\n" );
document.write( "The Doppler effect causes a sound moving towards you to sound higher pitched and a sound moving away from you to sound lower pitched, like observed in listening to the car horn in the video.\r<BR>\n" );
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document.write( "The equation for this is  <BR>\n" );
document.write( "f= c/(c+v)f0<BR>\n" );
document.write( " , where<BR>\n" );
document.write( "f is the observed frequency (pitch) of the sound, in Hertz<BR>\n" );
document.write( "c is the speed of sound, about 761 miles per hour,<BR>\n" );
document.write( "v is the speed of the sound source, in this case the car, in miles per hour<BR>\n" );
document.write( "f0 is the frequency of the sound when stationary\r<BR>\n" );
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document.write( "Using a spectrum analyzer, we could determine the observed frequency when the car was driving away was 239 Hz and the stationary frequency was 256 Hz.\r<BR>\n" );
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document.write( "Use this information and the equation to estimate the speed of the car in miles/hour, to 1 decimal place. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #811704 by </B><A HREF=/tutors/aboutme.mpl?userid=mananth><B>mananth(16946)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=mananth><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=mananth><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=811704\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=f=+c%2F%28c%2Bv%29f0 ALIGN=MIDDLE  ALT=\"f=+c%2F%28c%2Bv%29f0\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+%28c%2Bv%29+=+c%2Ff%2Af0 ALIGN=MIDDLE  ALT=\"+%28c%2Bv%29+=+c%2Ff%2Af0\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+v=+%28+c%2F+f%2Af0%29-c ALIGN=MIDDLE  ALT=\"+v=+%28+c%2F+f%2Af0%29-c\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "c= 761mph<BR>\n" );
document.write( "f=239 Hz<BR>\n" );
document.write( "f0=256 Hz\r<BR>\n" );
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document.write( "(761/239*256)- 761\r<BR>\n" );
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document.write( "v= 54.13 mph<BR>\n" );
document.write( " </SPAN>\n" );
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