p-n photodiode is fabricated from a semiconductor with a band-gap of 2.5 eV. It can detect a signal of wavelength:
1. 6000 Å
2. 4000 nm
3. 6000 nm
4. 4000 Å
 
Subtopic:  Energy Band theory |
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A p-n photodiode is made of a material with a bandgap of 2.0 eV. The minimum frequency of the radiation that can be absorbed by the material is nearly:

1.  10×1014 Hz

2.  5×1014 Hz

3.  1×1014 Hz

4.  20×1014 Hz

Subtopic:  Energy Band theory | Applications of PN junction |
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In the energy band diagram of a material shown below, the open circles and filled circles denote holes and electrons respectively. The material is a/an: 

1. p-type semiconductor

2. insulator

3. metal

4. n-type semiconductor

Subtopic:  Energy Band theory |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology