Find the radiation pressures (in atmospheres) on a totally absorbing surface and a totally reflecting surface. Answer in the order indicated. Express your answers in atmospheres separated by comma.

The density of a liquid could be found by using

Which notation is used to represent an alpha particle? a. b. c. d.

Asheet of steel 1.5 mm thick has nitrogen atmospheres on both sides at 1200oc and is permitted to achieve a steady-state diffusion condition. the diffusion coefficient for nitrogen in steel at this temperature is 6 x 10- 11 m2 /s, and the diffusion flux is found to be 1.2 x 10-7 kg/m2 -s. also, it is known that the concentration of nitrogen in the steel at the high-pressure surface is 4 kg/m3 . how far into the sheet from this high-pressure side will the concentration be 2.0 kg/m3 ? assume a linear concentration profile.