(a) compute the radius r of an impurity atom that will just fit into an fcc octahedral site in terms of the atomic radius r of the host atom (without introducing lattice strains). entry field with correct answer 0.414 r

radius r is  0.414 R

Explanation:

Given data

FCC octahedral site

atomic radius R

to find out

radius r

solution

we know that at FCC octahedral

length of side = 2 R + 2r

and by pythagorean theorem

a = 2√2R

here a = 2R + 2r

so 2R + 2r = 2√2R

so r = ( √2R )- R

r = 0.414 R

so  radius r is  0.414 R

truck y has a greater velocity than truck x.

i really dont know but i will try okay.

so i think u would just add all them up and get your answer..