Select toward or away for this super fast train Toward? = 1 makes the train approach you Toward? = 0 makes train move away from you Why the color change? See joke below
As train moves away from you it is red-shifted (stretched light waves, so longer wavelength) As train moves towards you, it is blue-shifted (compressed waves, so shorter wavelength) We see longest visible wavelengths as near red We see shortest visible wavelengths as blue to violet Train's going super fast, say half the speed of light A physics student gets pulled over for running a red light. He tries to use science to get out of it: Student: "Officer, because I was driving toward the light so fast, it actually appeared green to me due to blue-shift!" Officer: "I see. In that case, I'm not giving you a ticket for the light. I'm giving you a speeding ticket for going 100,000 miles per second!"
