11. If the work function of the cathode metal is 3.0 eV, what is the least energy of the incident photon it could emit photoelectron?
a. 1.50 eV
b. 2.90 eV
c. 3.50 eV
d. 6.01 eV

Which two objects have the greatest gravitational force acting between them

What happens to the light rays when they hit the specimen?

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.