The speed of the neutrons is 1.53 x 10³ m/s and the angle of the second interference maximum is 66.7⁰.
The speed of the neutrons is calculated as follows;
v = h/mλ
v = (6.626 x 10⁻³⁴)/(1.67 x 10⁻²⁷ x 0.26 x 10⁻⁹)
v = 1.53 x 10³ m/s
The angle of the second interference maximum is calculated as follow;
λ = dsinθ
sinθ = λ/d
sinθ = (0.26)/(0.283)
sinθ = 0.9187
θ = 66.7⁰
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