Consider the following argument:
The momentum transferred to a surface= I At.
Hence the force exerted on the surface = I A/c --- Step 1.
Hence the pressure on the surface= I/c --- Step 2.
Q: State the physical principle used in step 1 and in step 2.

Question

Consider the following argument:
The momentum transferred to a surface= I At.
Hence the force exerted on the surface = I A/c ---> Step 1.
Hence the pressure on the surface= I/c ---> Step 2.
Q: State the physical principle used in step 1 and in step 2.

paxpolaris · Answer

what is c?

anonymous · Answer

c is the speed of light, I is the energy flux or light of intensity and A is the area of the surface.

paxpolaris · Answer

step to is just pressure =  Force / Area