Question
Question: The maximum wavelength of electromagnetic radiation which can create a hole electron pair in germani...
The maximum wavelength of electromagnetic radiation which can create a hole electron pair in germanium (Given that forbidden energy gap in germanium is 0.72eV)
A
1.7×10−6m
B
1.5×10−5m
C
1.3×10−4m
D
1.9×10−5m
Answer
1.7×10−6m
Explanation
Solution
: here, Eg=0.72eV=0.72×1.6×10−19j
If λis the maximum wavelength of electromagnetic radiation which can create a hole- electron pair in germanium, then
Eg=λhc
Or λ=Eghc=0.72×1.6×10−196.62×10−34×3×108=1.7×10−6m