Question: Wave condition

I use Audacity setting as default and the wave has colored in blue area and colored in white area. What is that mean blue and white? Please tell me.
It sometimes different wave occurred even it’s same tone when to record but the recorder is not out of order. White is getting increased

Is there a way to identify the electronic spectrum by Audacity? I’m irradiated electronic spectrum beam around me.
Screen Shot 2015-01-06 at 17.40.33.png

Have a read of this page in the Manual: Audacity Manual



Thank you very much for prompt respond. It was helped.