An fcc iron-carbon alloy initially containing 0.20 wt% c is carburized at an elevated -1 and temperature (semi-infinite diffusion) where the diffusivity is 2 x 10-15 cm2sec in an atmosphere wherein the surface carbon concentration is maintained at 1.1 wt%. at what depth is the carbon concentration equal to 0.3612 wt% if the process time was 24 hours

it would be a gas formation

answer: they produce more slow than unicellular organisms.

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.

answerapplication program;