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A solutionconductscurrent when positive and negative ions are randomly dissolved in it.Pure waterdoesn't have enough ions but when you add H C l you add a strong electrolyte so, after the addition, solutioncan conduct electricityvery well.

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Due to scattering of light

आकाश का रंग नीला प्रकाश के प्रकीर्णन के कारण दिखाई देता है। अब प्रकाश का प्रकीर्णन क्या होता है ?

प्रकाश का प्रकीर्णन :

जब प्रकाश किसी ऐसे माध्यम से गुजरता है ,जिसमे अति सूक्ष्म आकर के कण विद्यमान रहते हैं ,तो इन कणो के द्वारा प्रकाश का कुछ भाग सभी दिशाओं में फ़ैल जाता है। इस घटना को प्रकाश का प्रकीर्णन कहते हैं। लाल रंग के प्रकाश का प्रकीर्णन सबसे कम तथा बैंगनी रंग के प्रकाश का प्रकीर्णन सबसे अधिक होता है।

The specific heat of water is different from the specific heat of ice and so adding 'wet ice' into a calorimeter experiment can increase the mass of the water in the calorimeter and become a source of inacurracy.

physics is the study of matter and energy .This includes sub-topics like1.General physics 2.Thermal physics 3.light and waves4.Electricity and magnetism

Velocity of the water = √2gh = √2*9.8*5 = √98 = 7√2m/s

now when radius of hole = 2mm A = π(0.002)² m²

rate of flow Q = A.v = π *4*7√2 × 10^-6 = 0.000124 m³/s = 1.24 × 10-⁴ m³/s.

Refractive Index = Speed of light in Air / Speed of light in medium

Speed of light in medium = Speed of light in air / Refractive index

=> Speed of light in medium = 3 × 10⁸ / 1.5

=> Speed of light in medium = 2 × 10⁸ m/s

So, Percentage Change = ( Change in Speed / Speed of light in air ) * 100

=> Change in Speed = 3 × 10⁸ - 2 × 10⁸

=> Change in speed = 10⁸ ( 3 - 2 ) = 10⁸

=> Percentage change = ( 10⁸ / 3 × 10⁸ ) * 100

=> Percentage change = ( 1 / 3 ) * 100

=> Percentage change = 33.34 %

Refractive Index = Speed of light in Air / Speed of light in medium

Speed of light in medium = Speed of light in air / Refractive index

=> Speed of light in medium = 3 × 10⁸ / 1.5

=> Speed of light in medium = 2 × 10⁸ m/s

So, Percentage Change = ( Change in Speed / Speed of light in air ) * 100

=> Change in Speed = 3 × 10⁸ - 2 × 10⁸

=> Change in speed = 10⁸ ( 3 - 2 ) = 10⁸

=> Percentage change = ( 10⁸ / 3 × 10⁸ ) * 100

=> Percentage change = ( 1 / 3 ) * 100

=> Percentage change = 33.34 %

This is the required answer

Refractive Index = Speed of light in Air / Speed of light in medium

Speed of light in medium = Speed of light in air / Refractive index

=> Speed of light in medium = 3 × 10⁸ / 1.5

=> Speed of light in medium = 2 × 10⁸ m/s

So, Percentage Change = ( Change in Speed / Speed of light in air ) * 100

=> Change in Speed = 3 × 10⁸ - 2 × 10⁸

=> Change in speed = 10⁸ ( 3 - 2 ) = 10⁸

=> Percentage change = ( 10⁸ / 3 × 10⁸ ) * 100

=> Percentage change = ( 1 / 3 ) * 100

=> Percentage change = 33.34 %

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Momentum is a vector quantity,hence it cannot be represented by a scalar.

answer is c momentum

thanks

Refractive Index = Speed of light in Air / Speed of light in medium

Speed of light in medium = Speed of light in air / Refractive index

=> Speed of light in medium = 3 × 10⁸ / 1.5

=> Speed of light in medium = 2 × 10⁸ m/s

So, Percentage Change = ( Change in Speed / Speed of light in air ) * 100

=> Change in Speed = 3 × 10⁸ - 2 × 10⁸

=> Change in speed = 10⁸ ( 3 - 2 ) = 10⁸

=> Percentage change = ( 10⁸ / 3 × 10⁸ ) * 100

=> Percentage change = ( 1 / 3 ) * 100

=> Percentage change = 33.34 %

Hydropower plantscapture theenergyof falling water to generate electricity. A turbine converts the kineticenergyof falling water into mechanicalenergy. Then a generator converts the mechanicalenergyfrom the turbine into electricalenergy.

18= 20 ans. and 19 =25

and 20 =4-2/10-5 then it is your answer

When a horse is trying to pull a cart, he pushes the ground backward at an angle from the horizontal. According to Newton’s third law of motion, the ground also apply equal reaction force on the feet of the horse in opposite direction. The vertical component of reaction balances the weight of the horse and horizontal component is responsible for motion of the cart. In empty space, there is no reaction force, therefore a horse cannot pull a cart.

The correct answer is option (4) because the current flowing through the circuit increases and L1 and L2 in series so same amount of current flows through them.

tq

Pressure at surface of sea = 760 mm Hg

= 1033.3 cm H2O

= 10.3 m H2O

Pressure at 100 m depth = 100 + 10.3 = 110.3 m H2O

Assuming temperature to constant,

P1V1(at surface) = P2V2(at 100 m depth)

10.3 x V1= 110.3 x V2

V2= 0.093 V1

= 9.3% of V1.

Del s/s=2del r/rDel V/V=3del r/rSo %change in volume is maximum

let BxA = R

BxA is a vector which is perpendicular to both B & A ...

(BxA).A = R.A

R perpendicular to A so dot product will be 0 ... (dot product of any two perpendicular vectors is 0)

so , (BxA).A =0

Convert 25km into meter=25000total distance=25000+4001 hour= 60 min.Speed=Distance/time =25400/60 = 423.33 m/min.

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where is the solved answere

When the spring (having spring constant=k) is stretched by length x, restoring force will beF = -kxHere, -ve sign shows that force is always in direction opposite to displacement.

The restoring force is central, hence particle will move in S.H.M. about equilibrium position.Acceleration here is given bya = F/m = -kx/m

When just released x = x(max).Hence a = a(max).

Hence, acceleration will be maximum when spring is just released.

All heat engines between twoheat reservoirsare less efficient than a Carnot heat engine operating between thesamereservoirs

Carnot theorem states that no heat engine working in a cycle between two constant temperature reservoirs can be more efficient than a reversible engine working between the same reservoirs.

Suppose there are two enginesEAEAandEBEBoperating between the given source at temperature T1 and the given sink at temperature T2.

LetEAEAbe any irreversible heat engine andEBEBbe any reversible heat engine. We have to prove that efficiency of heat engineEBEBis more than that of heat engineEAEA.

Suppose both the heat engines receive same quantity of heat Q from the source at temperature T1.

LetWAWAandWBWBbe the work output from the engines and their corresponding heat rejections be(Q–WA)(Q–WA)and(Q–WB)(Q–WB)respectively.

Assume that the efficiency of the irreversible engine be more than the reversible engine i.e.ηA>ηBηA>ηB

Hence,WAQ>WBQWAQ>WBQ

i.eWA>WBWA>WB

Now let us couple both the engines andEBEBis reversed which will act as a heat pump. It receives(Q–WB)(Q–WB)from sink andWAWAfrom irreversible engineEAEAand pumps heat Q to the source at temperature T1.

The net result is that heatWA–WBWA–WBis taken from sink and equal amount of work is produce. This violates second law of thermodynamics.

Hence the assumption we made that irreversible engine having higher efficiency than the reversible engine is wrong.

Hence it is concluded that reversible engine working between same temperature limits is more efficient than irreversible engine thereby proving Carnot’s theorem.

The iron occupy some volume and weight thus displace some amount of water when placed in boat or when unloaded in water. Now, when the iron are on the boat the volume occupied by them will be greater than when they are in water. This s what causes the water level to drop as they are unloaded.

Lets see how...

The volume of water displaced when stones are in boat will be

dV = (mboat+ miron)/ρwater

(as volume = mass/density)

here,

mboatis the mass of the boat and mironis the mass of the iron

and ρwateris the density of water = 1 gm/cc

so,

dV = mboat+ miron

now,

The volume of water displaced when iron are in boat will be

dV = (Wboat/ρwater)+ (Wiron/ρiron)

so,

dV' = mboat+ (miron/ρiron)

here

ρironis the density of iron which is greater than 1 gm/cc.

so,

dV > dV'

thus, volume displaced in the first case will be more than that of the second case.

hence, correct option is (b)

Ans :- TheBig Bang theoryis the prevailing cosmological model for the observable universe from the earliest known periods through its subsequent large-scale evolution. After its initial expansion, the universe cooled sufficiently to allow the formation of subatomic particles, and later simple atoms.

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The Device is a full wave rectifier.

AFull Wave Rectifieris a circuit, which converts an ac voltage into a pulsating dc voltage using both half cycles of the applied ac voltage. It uses two diodes of which one conducts during one half cycle while the other conducts during the other half cycle of the applied ac voltage.

We have to Current . Bt u have find Charge ????? Is it the solution is right ??

I think SI unit of I is A bt u hve written C . Is it correct ??

the value will be that of the lower value between them

that is NA2.

Coal is a combustible black or dark brown rock consisting chiefly of carbonized plant matter, found mainly in underground seams and used as fuel.

thanks for solving my problem

Sir please solve this using r^³

Thanks for the answer

Paramagnetic materialshaveasmall, positive susceptibility tomagneticfields. Thesematerialsare slightly attracted bya magneticfield and thematerialdoes not retain themagnetic propertieswhen the external field is removed.They get their strongmagnetic propertiesdue to the presence ofmagneticdomains.

1 kWh = 1000 × joule/sec × 60 × 60 sec

⇒ 1 kWh = 1000 × 60 × 60 joule/sec × sec

⇒ 1 kWh = 1000 × 60 × 60 joule

⇒ 1 kWh = 36, 00, 000 joule

Joule's Law of Heating. Theheat which is produced due to the flow of current within an electric wire, is expressed in unit ofJoules. The heatgenerated due to the flow of current is proportional to the time of current flowing, when the electrical resistance and the amount of current is constant.

Bucket Elevators are employed for caring coal in vertical direction.

Option (a) is correct.

option a is correct.