The bandgap of Si is 107.1 kJ/mol.What is the maximum wavelength of light that can excite an electron transition across the band gap? (h = 6.626 $\times$ 10^-34 J.s; c = 3.000 $\times$10⁸ m/s)

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The energy of the bandgap in joules is 107.1 kJ/mol divided by Avogadro's number (6.022 x 10^23 mol^-1), which gives approximately 1.78 x 10^-19 J. Using the equation E = hc/λ, where E is the energy, h is Planck's constant, and c is the speed of light, we solve for λ (wavelength) to find λ = hc/E. Substituting the values, λ ≈ 1118 nm.

The Bandgap of Si Is 107 ×\times× 10-34 J ×\times× 108 M/s) A) 551

The Bandgap of Si Is 107 $\times$ 10^-34 J $\times$ 10⁸ M/s)
A) 551