initial speed (m/s)      KE (eV)        wavelength         Temp (K)
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         100 m/s            0.000 0052       0.024 m             0.12

       1,000                0.005 2        240     um           12

      10,000                0.52             2.4   um         1200

     100,000               52               24     nm         120 thousand

   1,000,000             5200                0.24  nm          12 million

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