qu.1.topic=Spectra - Fill in the Blanks@

qu.1.1.mode=Blanks@
qu.1.1.editing=useHTML@
qu.1.1.name=Types of Spectra@
qu.1.1.question=<P>Kirchoff's Laws describe the rules governing creation of the three types of spectra: continuous, emission, and 
absorption.  One can create a(n) <1> spectrum by starting with a(n) <2> spectrum and <STRONG>$combine</strong> an emission spectrum.  
$object1 produce <3> spectra while $object2 produce <4> spectra.</p>
<BR>
<P>All solids and high density gases produce light at all wavelengths (a continuous spectrum) due to their temperature. The plot 
of intensity versus wavelength for a continuous spectrum is known as a(n) <5>. These curves are unique for objects of 
different <6> and they don't intersect each other.  As the temperature of an object $tempchange the peak wavelength <7> as described by 
Wien's Law. This explains why really $temp stars appear <8> in the sky. The flux (total energy per second per m<sup>2</sup>) is governed by the 
Stefan-Boltzmann Law. It states that if you $change the temperature of a blackbody, you increase the flux by a factor of <9>.<p>  
<BR>
<P>Spectra are shifted in wavelength by the Doppler shift.  If a star is traveling $dir us, its spectral lines will be <10> compared 
to their laboratory values.  While a star that is traveling on a parallel trajectory to our solar system will have <11> spectral lines.@

qu.1.1.algorithm=
$num=$rint(2);
$combine=switch($num,"adding","subtracting away");
$firstSpectra=switch($num,"continuous","absorption");
$secondSpectra=switch($num,"absorption","continuous");

$num0=$rint(2);
$object1=switch($num0,"Gas discharge tubes","Stars");
$object2=switch($num0,"stars","gas discharge tubes");
$firstSpectra2=switch($num0,"emission","absorption");
$secondSpectra2=switch($num0,"absorption","emission");

$num1=$rint(2);
$change=switch($num1,"double","triple");
$flux=switch($num1,16,81);
$badflux=switch($num1,81,16);

$num2=$rint(2);
$tempchange=switch($num2,"increases","decreases");
$wavechange=switch($num2,"decreases","increases");
$badwavechange=switch($num2,"increases","decreases");

$num3=$rint(2);
$temp=switch($num3,"cool","hot");
$goodcolor=switch($num3,"red","blue");
$badcolor=switch($num3,"blue","red");

$num4=$rint(2);
$dir=switch($num4,"toward","away from");
$shift=switch($num4,"blueshifted","redshifted");
$badshift=switch($num4,"redshifted","blueshifted");@

qu.1.1.blank.1=$firstSpectra,$secondSpectra@
qu.1.1.blank.2=$secondSpectra,$firstSpectra@
qu.1.1.blank.3=$firstSpectra2,$secondSpectra2,continuous@
qu.1.1.blank.4=$secondSpectra2,$firstSpectra2,continuous@
qu.1.1.blank.5=blackbody curve,intensity curve,light curve,power spectrum curve@
qu.1.1.blank.6=temperatures,wavelengths,frequencies,fluxes@
qu.1.1.blank.7=$wavechange, $badwavechange@
qu.1.1.blank.8=$goodcolor,$badcolor,green,yellow,orange,white@
qu.1.1.blank.9=$flux,$badflux,8, 4, 9, 27@
qu.1.1.blank.10=$shift,$badshift,unshifted@
qu.1.1.blank.11=unshifted,blueshifted,redshifted@

qu.1.1.grader.1=menu@
qu.1.1.grader.2=menu@
qu.1.1.grader.3=menu@
qu.1.1.grader.4=menu@
qu.1.1.grader.5=menu@
qu.1.1.grader.6=menu@
qu.1.1.grader.7=menu@
qu.1.1.grader.8=menu@
qu.1.1.grader.9=menu@
qu.1.1.grader.10=menu@
qu.1.1.grader.11=menu@