Infrared Remote Controls & Red Light: How Fast Does It Need To Go?

[genq]

What happens if an infrared remote control is pointing and coming at your eye really fast while transmitting... would the frequency of the em waves increase? If so, how fast would it need to be traveling in order to appear red?

 

[collinsmark]

How angry is the boyfriend/girlfriend that is hurling the remote control at your face?

 

[collinsmark]

Seriously though, the angriest of all angriest boyfiends/girlfriends could not cause enough Doppler shift to cause the infrared light to appear visible simply by hurling it at your face, without some sort of mechanized launching apparatus such as a highly sophisticated rail-gun or some such, which is beyond our present technology. On the other hand, a very angry boyfiend/girlfriend, might be able to hurl a well aimed remote control at your head such that you see red after the fact.

 

[Weissritter]

Seriously though, the angriest of all angriest boyfiends/girlfriends could not cause enough Doppler shift to cause the infrared light to appear visible simply by hurling it at your face, without some sort of mechanized launching apparatus such as a highly sophisticated rail-gun or some such, which is beyond our present technology.

Hey! I wanted to make a Doppler roller-coaster, with humans having enough speed to see the same colors through all the trip while the light itself did change.

Anyway, the easiest way to use Doppler's is for sound, not light. If you research enough the topic of light you could end up getting a Nobel or banned from PF