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Question: 

The band gap of silicon is 1.12 eV.

  1. For what range of wavelengths will silicon be transparent? (See Example 29–5.) In what region of the electromagnetic spectrum does this transparent range begin?
  2. If window glass is transparent for all visible wavelengths, what is the minimum possible band gap value for glass (assume $\lambda$ = 400 nm to 700 nm)? [Hint: If the photon has less energy than the band gap, the photon will pass through the solid without being absorbed.]

Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.

Quick Answer: 
  1. $\lambda > 1.1 \; \mu \textrm{m, infrared}$
  2. $3.1 \textrm{ eV}$

Giancoli 7th Edition, Chapter 29, Problem 20

(2:20)

Chapter 29, Problem 20 is solved.

View sample solution