The wavelength and the spectral region for a single electron transfer across the band gap in a semi conductor… · ABC26PH0186

Subject: Physical Chemistry · Chapter: Solid State Chemistry · Topic: Band Theory · Exam: CSIR NET 2012 · Marks: 2 · Difficulty: Hard

The wavelength and the spectral region for a single electron transfer across the band gap in a semi conductor $\left(E_{x}-1.98 \times 10^{-19}\right)$ are $\left[h=6.626 \times 10^{-34}\,\mathrm{Js}, c=3 \times 10^{8}\,\mathrm{m\,s^{-1}}\right]$

(a)1000 nm, UV

(b)1000 nm, IR

(c)500 nm, visible

(d)500 nm, FAR IR

Answer

Answer: B ✓ checked by 4AB · confidence high

Explanation

λ = hc/E = (6.626×10⁻³⁴ × 3×10⁸)/1.98×10⁻¹⁹ ≈ 1.0×10⁻⁶ m = 1000 nm — infrared (b).

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