SHOW WORK FOR POINTS! The band gap of silicon is 1.12 eV. Part A For what minimu
ID: 1306449 • Letter: S
Question
SHOW WORK FOR POINTS!
The band gap of silicon is 1.12 eV.
Part A
For what minimum wave-length will silicon be transparent?
Express your answer to three significant figures and include the appropriate units.
Part C
If window glass is transparent for all visible wavelengths, what is the minimum possible band gap value for glass (assume ? = 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.]
Express your answer using three significant figures.
?min =Explanation / Answer
1.E= 1.12 eV > hf [Energy of the photon]
lambda > 1.11 x 10^-6 m
2. Shorter the wavelength, higher the frequency and higher the energy of the photon. So the bandgap should be greater than atleast this energy. All photons of lesser energy will pass.
Hence hc/400 < Bandgap
Bandgap= 4.96 x 10^-19 J= 3.1eV
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