Find the speed parameter ? and Lorentz factor ? for an electron that has a kinet

Question

Find the speed parameter ? and Lorentz factor ? for an electron that has a kinetic energy of 4.00 keV. ??
Tries 0/7 ??
Tries 0/7 Find the speed parameter ? and Lorentz factor ? for an electron that has a kinetic energy of 3.00 MeV. ??
9.89 Tries 0/7 Find the speed parameter ? and Lorentz factor ? for an electron that has a kinetic energy of 4.00 keV. ?? Find the speed parameter ? and Lorentz factor ? for an electron that has a kinetic energy of 3.00 MeV. ?? 9.89Times10-1 Find the speed parameter ? and Lorentz factor ? for an electron that has a kinetic energy of 6.00 GeV. ??

Explanation / Answer

KE=(?-1)mc^2, mc^2=.511MeV of an electron.

1)4 keV = (?-1) * 511keV, (1000keV=1MeV) ?=1.018,

2) 3 MeV = (?-1) * .511MeV, ?=6.87

3) 6000 MeV = (?-1) * 511MeV, (1000 MeV = 1GeV) ?=12.74

I honestly don't know why many books insist on asking you for the harder to find variable first. Now that you have ?, its ez to get ?, or the ratio of v/c from ?=root(1/(1-?^2))

1) 1.018 = root(1/(1-?^2)), ?=.187

2) 6.87 = root(1/(1-?^2)), ?=.989

3) 12.74 = root(1/(1-?^2)), ?=.997

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