Question

The longest wavelength that can be absorbed by silicon, which has the band gap of 1.12 eV is 1.1 µm. If the longest wavelength that can be absorbed by another material is 0.87 µm, then the band gap of this material

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Answer 1

Hi

I have calculated the band gap of my visible-active photocatalyst using tauc's method. The calculated band gap was 2.86. According to the following equation, I have calculated the wavelength which is corresponding to that band gap:

Wavelength(in nm)=1240.8/Energy(in eV) = 433.57 nm

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Answer 2

Answer:

as we know the relationship between energy gap and wavelength is inverse hence what we can do is that build  a relation i.e. shown below

Step-by-step explanation:

Eg1=1.12ev , lambda 1=1.1 micro metre and  wavelength(2)(lambda 2)= 0.87 micro metre

step 2-Eg1 / Eg2 = wavelength 2/ wavelength 1

thus after putting these values in above formula is

1.12/x=0.87/1.1

answer= 1.416 ev