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<title>PyXPlot Users' Guide: The phy module</title>
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<b class="current">The <tt class="ttfamily">phy</tt> module</b>
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<div><h2 id="a0000000252">2.7 The <tt class="ttfamily">phy</tt> module</h2>
<p>The <tt class="ttfamily">phy</tt> module contains a selection of physical constants, listed in Chapter <a href="ch-constants.html">3</a>. It also contains the following functions: </p><p> <big class="large"><b class="bf">phy.Bv(<img src="images/img-0717.png" alt="$\nu ,T$" style="vertical-align:-4px;
width:29px;
height:16px" class="math gen" />)</b></big> <br />The phy.Bv(<img src="images/img-0717.png" alt="$\nu ,T$" style="vertical-align:-4px;
width:29px;
height:16px" class="math gen" />) function returns the power emitted by a blackbody of temperature <img src="images/img-0146.png" alt="$T$" style="vertical-align:0px;
width:13px;
height:12px" class="math gen" /> at frequency <img src="images/img-0271.png" alt="$\nu $" style="vertical-align:0px;
width:9px;
height:8px" class="math gen" /> per unit area, per unit solid angle, per unit frequency. <img src="images/img-0146.png" alt="$T$" style="vertical-align:0px;
width:13px;
height:12px" class="math gen" /> should have physical dimensions of temperature, or be a dimensionless number, in which case it is understood to be a temperature in Kelvin. <img src="images/img-0271.png" alt="$\nu $" style="vertical-align:0px;
width:9px;
height:8px" class="math gen" /> should have physical dimensions of frequency, or be a dimensionless number, in which case it is understood to be a frequency measured in Hertz. The output has physical dimensions of power per unit area per unit solid angle per unit frequency. <a name="a0000001592" id="a0000001592"></a> </p><p> <big class="large"><b class="bf">phy.Bvmax(<img src="images/img-0146.png" alt="$T$" style="vertical-align:0px;
width:13px;
height:12px" class="math gen" />)</b></big> <br />The phy.Bvmax(<img src="images/img-0146.png" alt="$T$" style="vertical-align:0px;
width:13px;
height:12px" class="math gen" />) function returns the frequency at which the function Bv(<img src="images/img-0717.png" alt="$\nu ,T$" style="vertical-align:-4px;
width:29px;
height:16px" class="math gen" />) reaches its maximum, as calculated by the Wien Displacement Law. The inputs are subject to the same constraints as above. <a name="a0000001593" id="a0000001593"></a> </p></div>
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