If ne and vd be the number of electrons and drift velocity in a semiconductor. When the temperature is increased

(1) ne increases and vd decreases

(2) ne decreases and vd increases

(3) Both ne and vd increases

(4) Both ne and vd decreases

Subtopic:  Types of Semiconductors |
 51%
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The energy gap of silicon is 1.14 eV. The maximum wavelength at which silicon will begin absorbing energy is

(1) 10888 Å                   

(2) 1088.8 Å

(3) 108.88 Å                   

(4) 10.888 Å

Subtopic:  Energy Band theory |
 63%
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Which of the following energy band diagram shows the N-type semiconductor

 

1. 

2. 

3. 

4. 

Subtopic:  Energy Band theory |
 81%
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Which of the energy band diagrams shown in the figure corresponds to that of a semiconductor

 

1. 

2. 

3. 

4. 

Subtopic:  Energy Band theory |
 54%
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The energy band diagrams for three semiconductor samples of silicon are as shown. We can then assert that

(1) Sample X is undoped while samples Y and Z have been doped with a third group and a fifth group impurity respectively

(2) Sample X is undoped while both samples Y and Z have been doped with a fifth group impurity

(3) Sample X has been doped with equal amounts of third and fifth group impurities while samples Y and Z are undoped

(4) Sample X is undoped while samples Y and Z have been doped with a fifth group and a third group impurity respectively

Subtopic:  Energy Band theory |
 75%
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In a semiconducting material, the mobilities of electrons and holes are μe and μh respectively. Which of the following is true?
1. \(\mu_{e} > \mu _{h}\)
2. \(\mu_{e} < \mu _{h}\)
3. \(\mu_{e} = \mu _{h}\)
4. \(\mu_{e} <0; ~\mu _{h}>0\)

Subtopic:  Types of Semiconductors |
 67%
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The temperature (T) dependence of resistivity (ρ) of a semiconductor is represented by

1. 

2. 

3. 

4. 

Subtopic:  Energy Band theory |
 72%
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In a forward biased P-N junction diode, the potential barrier in the depletion region is of the form

1. 

2. 

3. 

4. 

Subtopic:  PN junction |
 56%
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Different voltages are applied across a P-N junction and the currents are measured for each value. Which of the following graphs is obtained between voltage and current?

1. 

2. 

3. 

4. 

Subtopic:  PN junction |
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If the following input signal is sent through a PN-junction diode, then the output signal across RL will be

 

1. 

2. 

3. 

4. 

Subtopic:  PN junction |
 82%
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