document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=450140>Question 450140</A>: <I><SPAN STYLE=\"word-break: break-all;\"> This is one of the most confusing problems I have ever read. Please help me.<BR>\n" );
document.write( "The apparent magnitude, M of a celestial body can be approximated by the formula<BR>\n" );
document.write( "M=6-2.5 log I/I<BR>\n" );
document.write( "Where I is the intensity of light as measured from earth, and I0 is the approximate intensity light of light from the faintest star, visible by the naked eye. Find M if I and I0=1<BR>\n" );
document.write( "What apparent magnitude of a star whose light as measured from earth is 1,000,000 times as intense as the faintest stars visible to the naked eye.<BR>\n" );
document.write( "I'd appreciate any help. I don't seem to be able to understand this problem verbally or algebraically.  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #309690 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=309690\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The apparent magnitude, M of a celestial body can be approximated by the formula<BR>\n" );
document.write( "M=6-2.5 log I/Io<BR>\n" );
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document.write( "Note: I could not tell from your post if the fraction was I/Io or Io/I<BR>\n" );
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document.write( "Where I is the intensity of light as measured from earth, and Io is the approximate intensity light of light from the faintest star, visible by the naked eye. Find M if I and Io=1<BR>\n" );
document.write( "---<BR>\n" );
document.write( "M = 6-2.5*log[1/1]<BR>\n" );
document.write( "M = 6-2.5*0<BR>\n" );
document.write( "M = 6<BR>\n" );
document.write( "---------------------------<BR>\n" );
document.write( "What apparent magnitude of a star whose light as measured from earth is 1,000,000 times as intense as the faintest stars visible to the naked eye.<BR>\n" );
document.write( "----<BR>\n" );
document.write( "M = 6-2.5log[1,000,000Io/Io]<BR>\n" );
document.write( "---<BR>\n" );
document.write( "M = 6-2.5*log[10^6]<BR>\n" );
document.write( "---<BR>\n" );
document.write( "M = 6-2.5*6 = 6-15 = -9<BR>\n" );
document.write( "----<BR>\n" );
document.write( "Note: If the fraction is really Io/I the answer would be <BR>\n" );
document.write( "as follows: <BR>\n" );
document.write( "M = 6-2.5*log[10^-6] <BR>\n" );
document.write( "= 6-2.5*(-6) = 6+15 = 21<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );