  In special relativity theory the physical quantities are generally expressed
as function of the velocity. In the particular case of an extended object, the
factor 1/gamma of Lorentz contraction of its length in the direction of motion
is written as a function of the velocity of the extended object. The same
happens with the Lorentz factor gamma of time interval dilation of a moving
clock. In this paper we show that when gamma is written as a function of the
relativistic energy of the considered object the resulting expressions for the
length and for the time interval suggest that the contraction of length as well
as the dilation of the time interval are manifestations of the wave behavior of
matter.
