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Physics
Semiconductor Electronics: Materials, Devices And Simple Circuits
NCERT Solutions
NCERT Solutions
Semiconductor Electronics: Materials, Devices And Simple Circuits
6 Solutions
Q1
EXERCISES
14.1 In an n-type silicon, which of the following statement is true:
(a)
Electrons are majority carriers and trivalent atoms are the dopants.
(b)
Electrons are minority carriers and pentavalent atoms are the dopants.
(c)
Holes are minority carriers and pentavalent atoms are the dopants.
(d)
Holes are majority carriers and trivalent atoms are the dopants.
Q2
EXERCISES
14.2 Which of the statements given in Exercise 14.1 is true for p-type semiconductos.
Q3
EXERCISES
14.3 Carbon, silicon and germanium have four valence electrons each. These are characterised by valence and conduction bands separated by energy band gap respectively equal to (E_g)_C, (E_g)_Si and (E_g)_Ge. Which of the following statements is true?
(a)
(E_g)_Si < (E_g)_Ge < (E_g)_C
(b)
(E_g)_C < (E_g)_Ge > (E_g)_Si
(c)
(E_g)_C > (E_g)_Si > (E_g)_Ge
(d)
(E_g)_C = (E_g)_Si = (E_g)_Ge
Q4
EXERCISES
14.4 In an unbiased p-n junction, holes diffuse from the p-region to n-region because
(a)
free electrons in the n-region attract them.
(b)
they move across the junction by the potential difference.
(c)
hole concentration in p-region is more as compared to n-region.
(d)
All the above.
Q5
EXERCISES
14.5 When a forward bias is applied to a p-n junction, it
(a)
raises the potential barrier.
(b)
reduces the majority carrier current to zero.
(c)
lowers the potential barrier.
(d)
None of the above.
Q6
EXERCISES
14.6 In half-wave rectification, what is the output frequency if the input frequency is 50 Hz. What is the output frequency of a full-wave rectifier for the same input frequency.
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