A p-n photodiode is fabricated from a semiconductor with a band gap of 2.5 eV. It ca detect a signal of wavelength

6000 A^o

4000 nm

6000 nm

4000 A^o

Solution

4000 A^o

Only signals having wavelength less than threshold wavelength will be detected.
Energy E = hv = hc/λ

λ = hc / E
substituting the values of h, c and E in the above equation

$straight lambda space equals space fraction numerator 6.6 space straight x space 10 to the power of negative 34 end exponent space straight x space 3 space straight x space 10 to the power of 8 space over denominator 2.5 space straight x space 1.6 space straight x space 10 to the power of negative 19 end exponent end fraction space equals space 5000 straight A to the power of straight o As space 4000 space straight A to the power of 0 space less than space 5000 space straight A thin space to the power of straight o signal space of space wavelength space 4000 space straight A to the power of straight o space can space be space detected space by space the space photodiode.$

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Wave Optics

A p-n photodiode is fabricated from a semiconductor with a band gap of 2.5 eV. It ca detect a signal of wavelength

6000 A^o

4000 nm

6000 nm

4000 A^o

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Wave Optics

A p-n photodiode is fabricated from a semiconductor with a band gap of 2.5 eV. It ca detect a signal of wavelength 6000 Ao 4000 nm 6000 nm 4000 Ao

Some More Questions From Wave Optics Chapter

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

A p-n photodiode is fabricated from a semiconductor with a band gap of 2.5 eV. It ca detect a signal of wavelength

6000 A^o

4000 nm

6000 nm

4000 A^o