Posted by Andy on Wednesday, April 14, 2010 at 8:23pm.
How much work must be done to increase the speed of an electron from 0.200c to 0.210c? In (MeV)

physics  Count Iblis, Wednesday, April 14, 2010 at 9:15pm
The energy is given by E = gamma m c^2. Take the difference of this for
v= 0.210c and 0.200 c

physics  drwls, Wednesday, April 14, 2010 at 9:22pm
CountIblis is correct.
gamma is 1/sqrt[1  (v/c)^2]
gamma changes from 1.0206 to 1.0461
Multiply the difference by the rest mass energy.

physics  Andy, Wednesday, April 14, 2010 at 9:33pm
is rest mass energy
9.11e31 * (3e8)^2 ??
and do I need to convert from J to ev to KeV?
Thanks for the help

physics  drwls, Wednesday, April 14, 2010 at 9:43pm
Yes, that is the rest mass energy in Joules.
Since they do ask for the answer in MeV, use the conversion factor
1 MeV = 1.602*10^12 J
Answer This Question
Related Questions
 Physics  How much work must be done to increase the speed of an electron (a) ...
 College Physics  The electronvolt, eV, is a unit of energy (1eV = 1.602 ·10–19...
 physics  How much total kinetic energy will an electronposition pair have if ...
 Physics  Neutrons have a rest mass of 1.6749*1027 kg (equivalent to 939.6 MeV...
 physics  If a particle has kinetic energy K = 60 MeV when its momentum ...
 science  Neutrons have a rest mass of 1.6749*1027 kg (equivalent to 939.6 MeV...
 physics  Through beta decay, 55Cr (Chromium‑55 –with mass 54.94080 u) ...
 Physics  A uniform electric field of magnitude 370 N/C pointing in the positive...
 Physics  If we intercept an electron having total energy 1533 MeV that came ...
 physics  The average lifetime of muons at rest is 2.20 us. A laboratory ...
More Related Questions