Mass defect:

$\overline{){\mathbf{\u2206}}{\mathbf{m}}{\mathbf{=}}{{\mathbf{m}}}_{{\mathbf{p}}}{\mathbf{+}}{{\mathbf{m}}}_{{\mathbf{e}}}{\mathbf{+}}{{\mathbf{m}}}_{{\mathbf{n}}}{\mathbf{-}}{{\mathbf{m}}}_{\mathbf{a}\mathbf{t}\mathbf{o}\mathbf{m}}}$

Binding energy:

$\overline{){\mathbf{B}}{\mathbf{.}}{\mathbf{E}}{\mathbf{=}}{\mathbf{\u2206}}{\mathbf{m}}{\mathbf{\xb7}}{{\mathbf{c}}}^{{\mathbf{2}}}}$

Mass of proton = 1.007277 amu

Mass of electron = 0.0005486 amu

Mass of neutron = 1.008665 amu

1 amu = 931.5 MeV/c^{2}

**(a)**

Δm = (19 × 1.007277 + 19 × 0.0005486 + 21 × 1.008665) - 39.963 = 0.3686514 amu

(a) Calculate (in MeV) the total binding energy for ^{40}K. Express your answer using four significant figures.

(b) Calculate (in MeV) the binding energy per nucleon for ^{40}K. Express your answer using three significant figures.

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