What is the atomic mass unit (1 u) defined as exactly?

Type: MCQ • Marks: 1

A. 1/12th the mass of an unbound carbon-12 atom at rest

B. Mass of one proton

C. Mass of one hydrogen atom

D. Mass of one electron

Explanation

One unified atomic mass unit (u) is defined as 1/12 of the mass of a carbon-12 atom.

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Class 9th Science (MCQ)

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