You are doing x-ray diffraction on a crystal that has a cubic structure, using 0.340-nm x rays. part a if the lattice spacing is d = 6.70 × 10−10 m, what is the greatest bragg angle at which you observe peaks in the intensity of the diffracted rays?

∅ = 0.26°

Explanation:

Bragg's law states that:

n×λ = 2×d×sin(∅)

where:

then:

sin(∅) = λ/2×d

    ∅ = sin^-1(λ/2×d)

    ∅ = 0.26°

i think the answer is b

work: w = fd (given)

work done by chet   =50*1 = 50 j

work done by mika =40*2 = 80 j

work done by sara =30*1.5 = 45 j

work done by bill =60*0.5 = 30 j

students in order from the greatest amount of work done to the least is mika> chet> sara> bill

hence option (b) is correct.