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GK QUESTION#3156

Consider the following statements.

1. One mole contains exactly 6.02214076×10²³ specified elementary entities.

2. Planck’s constant relates the energy of a photon to its frequency.

Which statements are correct?

  1. A1 only
  2. B2 only
  3. CBoth 1 and 2Correct answer
  4. DNeither 1 nor 2
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Answer

C. Both 1 and 2

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Explanation

The SI fixes the Avogadro constant at exactly 6.02214076×10²³ mol⁻¹, so a mole contains that exact number of specified entities. Planck’s constant relates photon energy and frequency by E = hν. Both statements are true; the older carbon-12 mass-based definition is not the current exact definition.

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