The answer is most likely Kelvin
Answer: 3000k and centauri A
Explanation:
light waves do not require a medium so A would be your answer good luck :)
The radar device determines the vehicle's instantaneous speed.
I would argue that the purpose of the device is not to determine
whether individuals are driving safely. They only determine whether
individuals are driving within legal speed limits. There's much more
to 'safe' driving than that, but the radar gun can't detect it.