# Physics Course/Relativity

## Relativity

According to Newton Mass of any moving object remains the same regardless of speed travel . According to Einstein any moving object has Mass changes with speed travel

## Relativity Theory

### Change in Mass relate to speed travels

Speed of light is alsway constant , v = C . When matter moves at speed of light, matter no longer has mass . Observed fron Plank in experiment with Black Body Radiation

$m = 0$ when $v = C$

All matter moves at speed less than speed of light has a mass of mo

$m = m_o$ when $v < C$

Therefore for any matter moving at speed less than speed of light but not equal to the speed of light

$m = m_o (1 + \frac{v}{C})$

### Wave length of a Momentum

Any momentum travels at speed of light C carries quantum energy $E = h \frac{C}{\lambda}$ will have a wavelength

$\lambda = \frac{h}{p} = \frac{h}{C} \frac{1}{m}$

Which can be easily proved

$pC = h \frac{C}{\lambda}$
$\lambda = \frac{h}{p} = \frac{h}{C} \frac{1}{m}$
Last modified on 28 March 2013, at 15:37