The spectrum of a filament is given before, the left one have the lowest tempreture, the middle has the medium and the right one has the highest. My problem is, why the region of yellow light in the left has small range of spectrum while the red and green ones both enjoy large range? Also, why the temperature increasing results in the shrinking of red and green region and the expansion of yellow region? It's strange that the continous wavelenth has different pattern.
Thanks fo attention!