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Per NCERT §1.2 (revised SI), the kilogram is now defined via which fundamental constant?
AAvogadro number N_A
BBoltzmann constant k
CPlanck constant h
DCaesium frequency Δν_Cs
Answer & Solution
Correct answer: C. Planck constant h
NCERT Table 1.1: kg is defined by fixing h = 6.62607015 × 10⁻³⁴ J s. International prototype no longer used.
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