If P represents radiation pressure, C represents speed of light and Q represents radiation energy striking a unit area per second, then the non-zero integers x, y and z such that Px Qy Cz is dimensionless are :

x = 1, y = 1, z = 1 x = 1, y = -1, z = 1 x = -1, y = 1, z = 1 x = 1, y = 1, z = -1

x = 1, y = -1, z = 1

M0L0T0 = PxQyCz = [ML-1T-2]x [ML2T-2]y [LT-1]z x + y = 0 ⇒ x = -y -x + 2y + z = 0 -2x -2y - z = 0 x = -y