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Related Practice Questions :
Sodium has body-centered packing. The distance between the two nearest atoms is \(3.7~\mathring{A}\). The lattice parameter is:
1. \(6.8~\mathring{A}\)
2. \(4.3~\mathring{A}\)
3. \(3.0~\mathring{A}\)
4. \(8.6~\mathring{A}\)

 56%
NEET - 2009
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If the lattice parameter for a crystalline structure is 3.6 A0, then the atomic radius in fcc crystal is

1. 1.81A0

2. 2.10A0

3. 2.92A0

4. 1.27A0

 59%
NEET - 2008
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A p-n photodiode is made of a material with a band gap 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

 80%
From NCERT
NEET - 2008
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The electrical resistance of depletion layer is large because:

1. It has no charge carriers

2. It has a large number of charge carriers

3. It contains electrons as charge carriers

4. It has holes as charge carriers

 60%
From NCERT
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Avalanche breakdown is due to 

(1) Collision of minority charge carrier

(2) Increase in depletion layer thickness

(3) Decrease in depletion layer thickness

(4) None of these

 52%
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