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Option CSemiconductors act as insulators at low temperatures and conductors at higher temperatures.

Conduction occurs at higher temperature because the electrons surrounding the semiconductor atoms can break away from their covalent bond and move freely about the lattice

The conductive property of semiconductors forms the basis for understanding how we can use these materials in electrical devices.

sun is the original source of wind enery

wind and kinetic energy are the original source

range of accepted values of band gaps for intrinsic germanium (0.67 eV) and silicon (1.12 eV) at room temperature (300 K) [4].

Can you send me this question in English so that I can try

Option C is right

Please post the complete picture

Please post complete picture.

Very much resistance means we can consider it as a open circuit as welland in DC capacitor works as open circuitso Option -(3)please like the solution 👍 ✔️

An electric potential at one point means 1 joule of work is done to move one unit of positive charge from the point of infinity to a particular point.

The unit of the charge is coulomb.

This is when the electric potential is called as one volt.

Timbre and pitch are the characteristics of sound which help to identify the sound of a different voice. Thus, because of the difference in timbre and pitch of the sound wave you or any other can identify the voice of his friend sitting with others even in a dark room.

option 1) 4-6 hours

d) inductor with a small self inductance

Let us consider a long solenoid of cross - section area A through which current I is flowing . let L' be the length of thr solenoid ,φ =NBA = μN²AI/L'but , φ = LILI = μN²AI/L'

L = μN²A/L'

Theself inductanceisdefinedon the magnetic flux linked with thecoilwhenunitcurrent flows through it.

The self inductanceisdefinedas the emf induced in thecoil, when the rate of change of current in thecoilis 1 ampere/second. TheSI unitofself inductanceis henry (H).

190

the value of inductance varies as N²Ans:(c) N²

As it is small positive hence the substance is ferromagnetic substance

in the world is gooddest in family is mother

the answer could be option 1

ii) is the correct answer

iii) is the correct answer

1) is the right answer of the following

A material at a certain temperature does not have all of its particles at the same energy. In the basic definition of the word, "temperature" is the average random motional (kinetic) energy of the particles of a material. (Thermodynamics gives a broader definition to temperature, but we don't need this definition here.) Did you notice the word "average" in the basic definition? Just because we can assign a single number to the temperature of an object that is in thermal equilibrium does not mean that every atom of the material is moving with the same energy because of the nature of averaging. If the average height of everyone in the room is 5 feet 9 inches, this does not imply that everyone in the room is 5 feet 9 inches tall. Some people will be 6 feet tall while others will be 5 feet 6 inches tall. The average of a set of a values only gives us a general idea of the group as a whole and does not tell us about any individual in the group. In the same way, the atoms in a material are all moving at different speeds and with different energies, even when the material has a constant and uniform temperature. Some of the atoms are moving faster than the speed corresponding to the material's temperature and some of the atoms are moving slower. A few of the atoms are moving much faster than what is implied by the temperature.

Treescreate an ecosystem to provide habitat and food for birds and other animals.

Treesabsorb carbon dioxide and potentially harmful gasses, such as sulfur dioxide, carbon monoxide, from the air and release oxygen.

One largetreecan supply a day's supply of oxygen for four people.

ok just wait for some

days

c) is correct answer

Parallel Axis Theorem

F/16 as they are equal and opposite q=1/4q and -q=-1/4q so.....F'=k(qx-q)/r²=kq²/r²x1/16......asF=kq²/r²

So, F'=F/16

the division line between solids and liquids is not always a definite one. It is rather ... Different substances have different properties. ...... 100 FORCE ♢F A a o J i E AF 12 ft.

option D

Since q^2/2c=E. as we know value of all. q=ne . E=25J. C=5*10^-9f by Putting all values..

q=sqrt(2cE)

ne=sqrt(25*2*5*10^-9)

ne=5*10^-4.n=5*10^-4/(1.6*10^-19)n=5*10^15/1.6n=3.12*10^15.Now You Have No of electrons.

Ans :- (a) When a capacitor is charged by a battery, work is done by the charging battery at the expense of its chemical energy. This work is stored in the capacitor in the form of electrostatic potential energy. Consider a capacitor of capacitance C. Initial charge on capacitor is zero. Initial potential difference between capacitor plates = zero. Let a charge Q be given to it in small steps. When charge is given to capacitor, the potential difference between its plates increases. Let at any instant when charge on capacitor be q, the potential difference between its plates V= q/c

Law of conservation of momentum:Aconservation lawstating that the total linearmomentumof a closed system remains constant through time, regardless of other possible changes within the system.

Molecular rangeis the maximum distance up to which amoleculecan exertforceof attraction on anothermolecule. It is of the order of 10-9 m for solids and liquids. liquid consist of a very large number ofmolecules.

Thesemoleculesattract each other bycohesive force. But theseforcehave only a shortrange.

Surface tension is tension of the surface film of a liquid caused by the attraction of the particles in the surface layer by the bulk of the liquid, which tends to minimize surface area.

Thespecific heatis the amount ofheatper unit mass required to raise the temperature by one degree Celsius. The relationship betweenheatand temperature change is usually expressed in the form shown below where c is thespecific heat. .

Things which are bad conductors of heat are used as insulators. In same occasions it is important (1) to prevent heat loss from a hot body (2) to prevent heat from entering cold body.1. The handles of saucepans, teapots, kettles, etc, are always made from substances like wood, plastic, etc, to prevent heat from entering the hand so that it can he held comfortably2. Air is a poor conductor of heat, this is why heat from our bodies does not escape easily to the atmosphere3. Fur, wool, cotton wool, cork, feathers, sawdust, trapped air in birds’ feathers etc. act as good insulators.Fur and feathers keep most animals and birds during winterBirds flutter their feathers in cold weather to trap air between their feathersWoolen clothes keep as warm during winterIn cold countries, glass windows in houses are double paned4. Refrigerators, ice boxes, ovens, solar heater panels and connecting pipes are made of double walls with filling of cork, air, cotton wool or polyurethane in between their walls.5. Quilts are always filled with either cotton or foamThe use of a non conducting material to reduce heat from escaping is called lagging

Frequencyis the number of occurrences of a repeating event per unit oftime. It is also referred to as temporalfrequency, which emphasizes the contrast to spatialfrequencyand angularfrequency. Theperiodis the duration oftimeof one cycle in a repeating event, so theperiodis the reciprocal of thefrequency.

As we know that change in velocity divided by change in time is the acceleration, we can write

dv/dt = adv = a dt

Now integrate both the sides. Limit the velocity from 0 to v.

Limit the time from 0 to 5.dv = 2 (t-1) dt

After integration:V = t^2 - 2t.

Now using the limits,

v = 5^2 - 2 (5)V = 25 - 10 = 15.

Hence the answer is 15m/s.