document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1067661>Question 1067661</A>: <I><SPAN STYLE=\"word-break: break-all;\"> How many seconds will light leaving Los Angeles take to reach the following locations (a) San Francisco (about 500km), (b) London (~10,000km), (c) the Moon (400,000km), (d) Venus (0.3 A.U. from Earth at its closest approach).   </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #682780 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=682780\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> How many seconds will light leaving Los Angeles take to reach the following locations (a) San Francisco (about 500km), (b) London (~10,000km), (c) the Moon (400,000km), (d) Venus (0.3 A.U. from Earth at its closest approach).<BR>\n" );
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document.write( "The commonly used term for the speed of light is 3e5 km/sec.<BR>\n" );
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document.write( "(a) San Francisco (about 500km)<BR>\n" );
document.write( "d = r*t<BR>\n" );
document.write( "t = d/r = 500/3e5 =~ 1.67e-3 seconds = 0.00167 seconds or 1.67 milliseconds.<BR>\n" );
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document.write( "Do the others the same way.<BR>\n" );
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document.write( "PS  blinking your eyes takes 100 to 400 milliseconds<BR>\n" );
document.write( "In 100 milliseconds light travels 30,000 km or 18,000 miles<BR>\n" );
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