A handy trick if you dont have a calculator to hand eg youre driving is to use the Fibonacci sequence 1 1 2 3 5 8. Wavelength l is measured in the units of meters m. Multiply the value by 062.
This represents a proper speed of 71 times the speed of light 9999 7071 7070.
You will get the wrong answer if you add the two speeds and divide the answer by two. C 2998 x 10 8 ms this problem wants us to use this number for speed of light h6626 x 10 -34 J-s Now we simply plug in making sure that our units match convert 129cm to meters 2998 x 10 8 ms 129m v 2998 x 10 8 ms 129m v. Lambda equals 2 start text m end text. Proper speed is the practice of calculating speeds from the perspective of a traveler who experiences slowing time.