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Intrusionv2
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Homework Statement
What is the mass defect of the 40Ca nucleus?
Homework Equations
Δm=(Zmp+(A-Z)mn)-m
The Attempt at a Solution
mass of 40Ca=40.078 amu
mass of proton in amu is mp=1.0073 amu
mass of neutron is mn=1.0087 amu
atmomic number of 40Ca is Z=20
its mass number is A=40
so the mass defect is
Δm=(Zmp+(A-Z)mn)-m
=0.242 amu
But it says the correct answer is 0.367u, why? What am I doing wrong? Thanks.