alleryThe atomic mass unit is defined as one twelfth of the mass of which atom?
ACarbon twelve
BCobalt twelve
CCalcium twelve
DCaesium twelve
Answer & Solution
Correct answer: A. Carbon twelve
1. Atomic masses need a reference standard to be quoted against.
2. That standard is one particular isotope.
3. The atomic mass unit is defined as one twelfth of the mass of the carbon twelve atom.
4. So the answer is carbon twelve.
_Source: syllabus Physics Part II, Ch 13 'Nuclei'_
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