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According to law of photochemical equivalence the energy absorbed (in ergs/mole) is given as (h = 6.62 × 10⁻²⁷ ergs, c = 3 × 10¹⁰ cm s⁻¹, Nₐ = 6.02 × 10²³ mol⁻¹)

1. 1.196 × 10¹⁶ λ
2. 1.196 × 10⁸ λ
3. 2.859 × 10⁵ λ
4. 2.859 × 10¹⁶ λ

Correct answer: 1.196 × 10⁸ λ

Solution

The energy absorbed per mole is calculated using the formula E = (h × c × Nₐ) / λ. Substituting the given values, the result matches option B.

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