Minimum number of photons of light of wavelength 4000Å, which provide 1J energy :

Chemistry · JEE Main · NTA Exams — Atomic Structure

1. 2 × 10¹⁸
2. 2 × 10⁹
3. 2 × 10²⁰
4. 2 × 10¹⁰

Answer

(A) 2 × 10 18

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