The conduction band in a solid is partially filled at 0 k.The solid sample is

A p-type semiconductor is obtained by doping silicon with

In a \(p\)-type semiconductor the acceptor level is situated 60m eV above the valence band.The maximum wavelength of light required to produce a hole will be [use \(hc=12400 eVA\)

Which type of semiconductor is obtained by mixing arsenic with silicon?

The dominant mechanisms for motion of charge carriers in forward and reverse biased silicon \(p-n\)junction are 

State the rule used in the operation of NOT gate.

Why doping is done in semiconductor?

Why diamond behaves like an insulator?

How 2-input NAND gate can be converted into a NOT gate?

Write the full forms of the terms (i) MSI and (ii) LSI used for different types of integrated circuits.

The energy gap of silicon is 1.14 eV. Find the maximum wavelength at which silicon starts energy absorption.

How does the conductivity and resistivity change with rise of temperature in case of intrinsic semiconductors?

A \(p-n\) junction is fabricated from a semiconductor width band gap of 2.8 eV. Can it detect a wavelength of 6000 nm?

What is the function of base region of a transistor? Why is this region made thin and slightly doped?

Write the functions of three segments of a transistor.

Which of the statements given in Exercise 14.1 is true for p-type semiconductors?

Consider a \(npn\) transistor with its base-junction forward biased and collector base junction reverse biased. Which of the following statements are true?

(a) Electrons crossover from emitter to collector.

(b) Holes move from base to collector.

(c) Electrons move from emitter to base.

(d) Electrons from emitter move out of base without going to the collector.

To reduce the ripples in a rectifier circuit with capacitor filter

(a) \(R_{ L }\) should be increased

(b) input frequency should be decreased.

(c) input frequency should be increased.

(d) Capacitors with high capacitance should be used.

Suppose a pure Si crystal has \(5\times 10^{ 28 }\) atmos \(m^{ -3 }\). It is doped by ppm concentration of pentavalent As. Calculate the number of electrons and holes. Given that \({ n }_{ i }=1.5\times { 10 }^{ 16 }m^{ 3 }\)

Can we take one slab of p-type semiconductor and physically join it to another n-type semiconductor to get p-n junction?

\(p-n\) junction is a semiconductor diode.It is obtained by bringing\(p-\) .type semiconductor include contact with \(n-\) type semiconductor .A thin layer is developed at the \(p-\)junction which is devoid of any charge carrier but has immobile ions .It is called depletion layer.At the junction a potential barrier appears,which does not allow the movement of majority charge carriers across the junction in the absence of any biasing of the junction.
\(p-\)n junction offers low resistance when forward biased and high resistance when reverse biased.Read the above paragraph and answer the following questions:
(i) Can we measure the potential barrier of \(p-n\) junction by putting a sensitive voltmeter  across its terminals?
(ii) What practical lesson do you draw from the above study?

Rohan was studying in a science college and was staying with his grandfather. One day,the old torch which was being used by Rohan's grand father stopped working.He asked Rohan to purchase a new torch for him.Rohan himself made a torch using LED with a small recharge battery and gave it to his grand father as a gift.Rohan explained the advantages of LED  over a bulb.Rohan's grand father was very happy.
Read the above passage and answer the following questions:
(i) What is LED? Name the two materials used in making LED ,whose light falls in the visible region.
(ii)Why LED is a better choice than a bulb in torch?
(iii) What do you think about the attitude of Rohan towards his grand father ?

Manoj wanted to do social work during vacations.He visited a remote village where there was no electricity.He made up his mind to help the villagers for getting the solar panels.For this he educated the villagers about techonology and uses of solar panels.he requested the villagers to Villagers agreed and applied for the solar panels.They got the same from government at reduced price.When the solar panels started working,the villagers were happy.
Read the passage and answer the following questions:
(i)What is solar panel?
(ii) What is the basic principle of working of a solar cell?
(iii) What are the basic values you assess in Manoj?