Which is the best predictor of the radioactive nature of an isotope? the proton-to-electron ratio the neutron-to-proton ratio the neutron-to-electron ratio the electron-to-proton ratio

Chemical energy is a form of energy. a. heat b. kinetic c. potential d. electromagnetic

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.

Wavelength of 125 meters is moving at a speed of 10 m/s. what is it's frequency?