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32m

1 mole=22.4 l0.1 mole =2.24 l

The region around the electric charge in which the stress or electric force act is called an electric field or electrostatic field. If the magnitude of charge is large, then it may create a huge stress around the region. The electric field is represented by the symbol E. The SI unit of the electric field is newton per coulomb which is equal to volts per meter.

Kohlrausch's lawstates that the equivalent conductivity of an electrolyte at infinite dilution is equal to the sum of the conductances of the anions and cations. If a salt is dissolved in water, the conductivity of the solution is the sum of the conductances of the anions and cations.

The practical application of KCL is to determine the amount of current flowing through individual electronic component in a circuit. Using that law we can manipulate current to the component by controlling resistance to it.

The KCL states that for a balanced network, the current coming at a node is equal to current outgoing. So, on a simple note, we can balance a given circuit by adjusting voltage and current so that at a selected node, the current if measured is zero because incoming current = outgoing current. So, by balancing we can calculate a no. of parameters from a circuit.

Ans :- An electromotive force series (EMF series) is a metal's ranking in respect to inherent reactivity. Reactivity of metals. The metals located at the top of the series are considered the most noble, with the highest level of positive electrochemical potential.

1. The reactivity of the metaldepends on its tendency to lose electrons, i.e., tendency to form cation . This tendency depends on the magnitude of standard electrode potential. The metal which has lower value of standard electrode potential readily loses the electron or electrons and is form cations. Such a metal is said to be chemically reactive metal. The chemical reactivity of metals increases from top to bottom in the emf series. The metal higher in the emf series is more active than the metal lower in the series.For example :-Li+ + e has electrode potential of -3.05,Where as K+ + e has electrode potential of -2.93As Li has least value of electrode potential , therefore Li is more reactive.

2. Electropositive character of metals :The electropositive character also depends on the tendency to lose electron or electrons. The electropositive character of metals also increases from top to bottom in the emf series.On the basis of standard electrode potential values, metals are divided into three groups(a) Strongly electropositive metals :Metals having standard electrode potential near about – 2.0 volt or more negative .Like alkali metals, alkaline earth metals are strongly electropositive in nature.(b) Moderately electropositivemetals: Metals having values of electrode potentials between 0.0 and about – 2.0 volt are moderately electropositiveAl, Zn, Fe, Ni, Co, etc., belong to this group.(c) Weakly electropositive :The metals which are above hydrogen and possess positive values of electrode potentials are weakly electropositive metals.Cu, Hg, Ag, etc., belong to this group.

3. Displacement reactions(a) To predict whether a given metal will displace another, from its salt solution:A metal lower in the emf series will displace the metal from its solution which is higher in the emf series, i.e., The metal having high standard electrode potential will displace the metal from its salt’s solution which has lower value of standard electrode potential. A metal higher in the series has greater tendency to provide electrons to the cations of the metal to be precipitated.

(b) Displacement of one nonmetal from its salt solution by another non-metal:A non-metal having high value of reduction potential will displace another non-metal with lower reduction potential, electrons readily.

(c) Displacement of hydrogen from dilute acids by metals :The metal which can provide electrons to H+ ions present in dilute acids for reduction, evolve hydrogen from dilute acids.The metal having negative values of reduction potential possess the property of losing electron or electrons.Thus, the metals occupying bottom positions in the electrochemical series readily liberate hydrogen from dilute acids.The metals which are above hydrogen in electrochemical series like Cu, Hg, Au, Pt, etc., do not evolve hydrogen from dilute acids.

(d) Displacement of hydrogen from water :Iron and the metals below iron are capable of liberating hydrogen from water. The tendency increases from top to bottom in electrochemical series.Alkali and alkaline earth metals liberate hydrogen from cold water but Mg, Zn and Fe liberate hydrogen from hot water or steam.

4. Reducing power of metals:Reducing nature depends on the tendency of losing electrons. More the negative electrode potential, more is the tendency to lose electron or electrons. Thus reducing nature increases from top to bottom in the electrochemical series.Sodium is a stronger reducing agent than zincAlkali and alkaline earth metals are strong reducing agents.

(v) Oxidising nature of non-metals :Oxidising nature depends on the tendency to accept electron or electrons. higher the value of electrode potential, higher is the tendency to accept electrons. Thus, oxidising nature decreases from top to bottom in the electrochemical series.

the ability of an optical instrument or type of film to separate or distinguish small or closely adjacent images.

1. Resolving power is the capacity of an instrument to resolve two points which are close together.2. In telescopes, very close objects such as binary stars or individual stars of galaxies subtend very small angles on the telescope. To resolve them we need very large apertures. We can use the Rayleigh’s to determine the resolving power. The angular separation between two objects must be

△θ = 1.22 λd

Resolving power = 1△θ = d1.22 λ

Thus higher the diameter d, better the resolution. The best astronomical optical telescopes have mirror diameters as large as 10m to achieve the best resolution. Also larger wavelengths reduce the resolving power and consequently radio and microwave telescopes need larger mirrors.

if there is leakage of LPG gas then there are chances of catching fire by electric shortage done by switching the the appliance

it can spot g by DJ by ghhbjjjkkkj

Aswitchis anelectricdevice that is used to complete or break anelectriccircuit

No. commuting handles will allow Current to flow through them, which may give us tremendous shock.

Torch and oven

how 1÷r^2 converted into r^-1

its the formula for integrals.

thank you so much

generator is odd one out.Reason : Rest of others are the substances which is used to slow down the flow of current but generator is used to generate electricity.

d) is the correct answer

plz mark it best if it helps u

A thyristor can be termed as DC switch.

if you know the law of homogeneity then dimension of at= bt=c right then

if you know the law of homogeneity then dimension of at= bt=c right then

The ceiling and walls behind the stages are made curved so that the sound after reflection reaches all corners of the hall uniformly.

The ratio is given by. (√i1+√i2)²/((√i1-√i2)²= (√400+1)²/(√400-1)²= (20+1/20-1)² = (21/19)² = 441/361

option D should be correct. and root should not be there in the option

c) Poisson's Ratio Because it ratio of same quantity i.e. lateral strain/longitudinal strain

I1/I2=(a1/a2)2

a1/a2 = √(l1/l2)

= √(25/9)

= 5/3

= 5:3

Like my answer if you find it useful!

The displacement is 0.

the displacement is also 0

Themaximum shear stressis themaximum concentratedshearforce in a small area. It is very critical for a structural engineer to locate and evaluate themaximum shear stressin a member in order to design the member in such a way to resist it

Acyclist bendsinwardswhileturning around acurvein order tonegotiatethe effects of slipping which would occur otherwise. Now, the leaning action of thecyclistprovides the necessary centripetal force required for following acurvedpath.

wrong answer

hum alag alag kyu nahi lga skte ye equations dono distances pr

2) 13 is the correct answer

4) is the correct answer

2) 13 is the correct answer

When they meet, their displacements will be same. Therefore ,

s= ut-(1/2)gt^2=u(t-4) -(1/2)g(t-4)^2

Simplifying and making t subject, we get

t=(u+2g)/g. OR

Substituting the values,

t=(98+19.6)/9.8 OR

t=12s after the first body was thrown.

Go and ask this question to your teacher 👌

Let assume initial velocity is u and constant acceleration a.

using s=ut+.5 a t^2

For first 5 second

10=5 u +.5x a x 25..........(1)

for next 3 seconds t=8 and s=20

20=8 u+.5xax64...........(2)

Solving 1 and 2

a=1/3 and u=7/6

Now for next 2 seconds t=10 and s'

S'=10x7/6 +.5x(1/3) 100

S'=170/6

Now distance travelled in 2 sec=(170/6)-20=50/6 meter

thnk u sir, it helped me a lot

48 is right answer of this question. please like my answer

what is your answer bhaiya

ds=ktdtS=1/2kt^2=1/2 2*3*3=9m

Velocity of train 'B' with respect to train 'A' = (115−25)km/h

VBA=−90km/h =−25m/s

Distance between the trains is 100m. Using the equations of motion

v^2=u^2−2as ,v=0

u^2=2as

625=2xax100

Then the least retardation that must be appiled to faster train to avoid a collision, a=3.125m/s^2

d) k.k = 0The dot product of any unit vector with itself is one. i.i = 1. j.j = 1. k.k = 1

d) k.k = 0

The dot product of any unit vector with itself is one. So, k.k = 1

b and f

B and F are in same phase as they are l distance apart thanks

Traditional Methods Used for Water Filtration

Filtration done in clay vessel:The technique consists of pouring water into clay vessel having a suitable pore size. The water settles down in the clay vessel and passes through the pores of the clay. The purified water collects in a jar placed at the bottom of the clay vessel.

Filtration done through cloth:This is another common filtration method used in the early years. The filtration process removes impurities such as debris, insects, dust particles and other suspended elements. Water passes through a thin white cloth, which removes impurities present in water.

Filtration done through Winnowing Sieve:The filtration process removes coarse particles and other physical impurities present in water. Raw water passes through a winnowing sieve, which filters all the impurities, thereby collecting fresh water, which is safe for drinking.

3.2is the correct answer of this question

3.2 is correct answer

3.2 is the Right answer

Angular velocity = w= 60rev/min1 revolution= 2pi radian one minute = 60 sec w= 60*2pi/60w= 2pi radian/secmass= 18g = 0.018 kgdistance =r= 8 cm = 0.08 m f= mv^2/r v=rw v^2=r^2w^2f= mr^2w^2/r r in division will be removed by removing square

F= mrw^2 f= 0.018*0.08*(2pi)^2square of 2 is 4and pi^2= 9.87 as per your questionTherefore,0.018*0.08*4*9.87= 0.05685= 0.057