Abstract:
In this work the required instruments had set up and required
material had prepared. In the first, powder of material gypsum and
graphite was taken as grams and projecting light form a distance and
change the grams with changing of the distance of the projecting light for
many times and thus got results by assistant of photocell and multimeter
to calculate change of the voltage with of grams of powder material and
taken as composite of two materials (gypsum and graphite) then hereafter
studies change of velocity to find different changed of light and properties
like wavelength , absorption ,transmission and reflection on the bases of
available results .
Results showed that the rate of absorption is greater than reflection rate
and rate of transmission is the least one these gypsum-graphite composite
improved the characteristics of each other with comparative the
characteristics of gypsum and graphite as different. The coefficients are
increased with increased the Mass of material.
