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Physics · UNITS AND MEASUREMENT

हिन्दी

According to the SI base units and definitions provided, the SI unit of thermodynamic temperature (kelvin) is defined by taking the fixed numerical value of which fundamental physical constant?

  1. A
    Planck constant \( h \)
  2. B
    Boltzmann constant \( k \)
  3. C
    Avogadro constant \( N_A \)
  4. D
    Elementary charge \( e \)
View Answer & Solution

Correct answer · Option B

Boltzmann constant \( k \)

Explanation

The kelvin is defined by taking the fixed numerical value of the Boltzmann constant k to be \( 1.380649 \times 10^{-23} \text{ J K}^{-1} \).
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