If pressure ,velocity of light and per area per second radiation energy are represented by P,C and Q respectively.Then,non-zero integers x,y,z that P^x Q^y C^z is dimensionless,then......... a) x=1, y=1, z=-1
b) x=1, y=1, z=1
c) x=-1, y=1, z=1
d) none of the above
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