Question

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

• 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

Hint:

Always write dimensions of each physical quantity first and then equate the powers of M, L, T separately to make the expression dimensionless.

Answer 1

The Correct Option is D