If \[P\] represents radiation pressure, \[c\] represents speed of light and \[Q\] represents radiation energy striking a unit area per second, then non-zero integers \[x,\,y\] and \[z\] such that \[{{P}^{x}}{{Q}^{y}}{{c}^{z}}\] is dimensionless, are [AFMC 1991; CBSE PMT 1992; CPMT 1981, 92; MP PMT 1992]

If \[P\] represents radiation pressure, \[c\] represents speed of ligh

1.	If \[P\] represents radiation pressure, \[c\] represents speed of light and \[Q\] represents radiation energy striking a unit area per second, then non-zero integers \[x,\,y\] and \[z\] such that \[{{P}^{x}}{{Q}^{y}}{{c}^{z}}\] is dimensionless, are [AFMC 1991; CBSE PMT 1992; CPMT 1981, 92; MP PMT 1992]
A.	\[x=1,\,\,y=1,\,\,z=-1\]
B.	\[x=1,\,y=-1,\,z=1\]
C.	\[x=-1,\,y=1,\,z=1\]
D.	\[x=1,\,y=1,\,z=1\]
Answer» C. \[x=-1,\,y=1,\,z=1\]