If P represents radiation pressure, c represents the speed of light and Q represents radiation....

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(121) If P represents radiation pressure, c represents the speed of light and Q represents radiation energy incident per unit area per second, then for what values of x, y and z the quantity will be dimensionless?
(a) x = 1, y = 1, z = -1 (b) x = 1, y = -1, z = 1
(c) x = -1, y = 1, z = 1 (d) x = 1, y = 1, z = 1