Saturday

December 20, 2014

December 20, 2014

Posted by **Andy** on Wednesday, April 14, 2010 at 8:23pm.

- physics -
**Count Iblis**, Wednesday, April 14, 2010 at 9:15pmThe 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 9:22pmCountIblis 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 9:33pmis rest mass energy

9.11e-31 * (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 9:43pmYes, 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 electron-volt, eV, is a unit of energy (1eV = 1.602 ·10–19...

physics - How much total kinetic energy will an electron-position pair have if ...

Physics - Neutrons have a rest mass of 1.6749*10-27 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*10-27 kg (equivalent to 939.6 MeV...

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 ...

Physics - A spring with constant speed of 3.5x10^4 N/m is initially @ its ...