The frequency range of human hearing is: 5 points 50 hz ��� 5,000 hz 20 hz ��� 20,000 hz 5 hz ��� 15,000 hz 20 db ��� 20,000 db

Zeros that follow non-zeros numbers and are also to the right of a decimal point are significant

Name the non metal condut electricity

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.