Then to get an idea of the optical range of the light recieved by the PMT, various filters were used and their amplitudes were looked at. Figure 7 shows the amplitudes with a yellow pass, a blue pass, and with no filter. Notice the differences in the amplitudes between the three as this matches what we believed would happen with filtered and unfiltered light. Ratios were then taken of the yellow filter and the blue filter with the light with no filter. The ratio of yellow filtered amplitude to the reference amplitude of the non filtered light was 0.3, ratio for the blue filtered light to the reference was 0.9, the ratio of the former and latter was 0.3 . We want to compare this data to a blackbody with a temperature of 17000 Kelvin with the wavelengths ranging from 250 nm to 800 nm since this is the limit of the PMT’s sensitivity. Figure 8 shows the blackbody theory at 17000 K vs wavelength.Plotted the intesity from blackbody theory and markers where these filters let transmitted light through the filter. The yellow filter transmits light from 310 nm to 440 nm. The blue filter trasnmits wavelengths from 500 nm to 575 nm. What can be understood from the proportions taken from figure 7 is if we can find a wavelength in the transmitted range of the yellow filter then we expect that 30\(\%\) of that value of that wavelength should be found in the transmitted area for the blue filter. It can be seen from from the theoretical curve that intensities are wouldnt be higher than \(2*10^-20 \frac{W}{m^2}\).