MEDIUMMCQ SINGLENEET ChemistryPhysical ChemistryAtomic StructureIntro
The number of photons of light with wave number ν̄ = 2.5 × 10⁶ m⁻¹ necessary to provide 1 J of energy are
0.2 × 10¹⁸
1.2 × 10¹⁷
2.2 × 10²⁰
3.2 × 10¹⁹
Explanation
E = nhcν̄ → n = E/(hcν̄) = 1/(2 × 10⁻²⁵ × 2.5 × 10⁶) = 1/(5 × 10⁻¹⁹) = 2 × 10¹⁸
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