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3. Negatively charged particles are called electrons.4. The human body is a good conductor of electricity. As our body cells contain various ions like sodium ion, potassium ion, chloride ion etc which have the tendency to conduct electricity and this makes our body a good conductor of electricity.

We know that wavelength of an electron is given by the relation,

λ = h/√2mV

where,

h = planks constant

m = mass of electron

V = energy of the electron,

keeping h and m constant, we have,

λ ∝ 1/√V

=> λ₂/λ₁ = √(V₁/V₂)

=> λ₂ = 10⁻¹⁰ x √(150/600)

=> λ₂ = 10⁻¹⁰ x 1/2 = 0.5 x 10⁻¹⁰ m

Hence the wavelength of 0.60 keV electron will be 0.5 x 10⁻¹⁰ m

Unit of energy is joule = kg*m²/s²Joule is a MKS unit and erg is a CGS unitMKS = CGS1 m = 100 cm1 s = 1 s1 kg = 1000 gmFrom above :1 joule = 1 kg*m²/s² = 1000 * 10000 / 1 cm*m²/s²= 10^7 gm*cm²/s² = 10^7 ergSo, 1 joule = 10^7 erg

Ans :- Industrial Uses for Acids and Bases. The most commonly made industrial chemical in the world, sulphuric acid hasnumerous applications across industries. Companies make it as a precursor to phosphoric acid, which, in turn,findsuse in detergents and phosphate fertilizers.

Sulfuric acid is used to makeother chemicals, reduce corrosion, refine oil and create fertilizers. Nitric acid is used to make explosives,dyesand fertilizers. Hydrochloric acid is used in science labs all over, and is used to make PVC, food products and helpextractmetals. It's also the acid in your stomach.

Mass per unit length of the wire,0.72 m

μ = 5.0×10−3kg

= 6.9 ×10–3kg m–1

Tension, T = 60 N

The speed of wave on the wire is given by,v=C√T/ μ

√ (60)/ (6.9x10-3kgm-1) = 93ms-1

f=c*wave numberf=3*10^8*2*10^14*10^-2(as it needs to be converted to metres)f=6*10^20sec^-1

The process ofscattering occurswhen small particles and gas molecules diffuse part of the incoming solarradiationin random directions without any alteration to thewavelengthof the electromagneticenergy. Scattering does, however, reduce the amount of incomingradiationreaching the Earth's surface.

Polarization is a property applying to transverse waves that specifies the geometrical orientation of the oscillations. In a transverse wave, the direction of the oscillation is perpendicular to the direction of motion of the wave.

Polarization is the property of wave that can oscillate with more than one orientation. A light wave that is vibrating in more than one plane is referred to as unpolarised light. The process of transforming unpolarized light into polarized light is known as polarization of light.

Let us derive the relation between polarization vector (P), displacement (D) and electric field (E):In the last article of polarization, we have discussed about the effect on dielectric placed in an external electric field E0and there will be electric field due to polarized charges, this field is called electric field due to polarization (Ep). (You can see the figure in that article).Rewrite equation (1) of that article, that is:E = E0– Ep(1)Polarization vector, P = P is equal to the bound charge per unit area or equal to the surface density of bound charges (because surface charge density is charge per unit area),Thus P = qb/A = σp(2)Where qbis bound charge and σpis surface density of bound charges.P is also defined as the electric dipole moment of material per unit volume.P = npwhere n is number of molecules per unit volume.Displacement vector, D= D is equal to the free charge per unit area or equal to the surface density of free charges,Thus D = q/A =σ(3)where q is free charge and σ is surface density of free charges.As for parallel plate capacitor (already derived in earlier articles):E = σ /ε0(4)Ep= σp/ε0(5)By substituting equations 4 and 5 in equation 1, we getE = σ /ε0– σp/ε0Or ε0E = σ – σ0By putting equations 2 and 3 in above equation, we getε0E = D – Por D = ε0E + PThis is the relation between D, E and P.

Dielectric polarizationis the term given to describe the behavior of a material when an external electric field is applied on it.

Here, Initial temperature ( Ti) = 80°C Final temperature ( Tf) = 50°C Temperature of the surrounding ( To) = 20°C t = 5 min A/C to Newton's law of cooling

Rate of cooling ( dT/dt) = K[ (Ti+Tf)/2 - To] ( Tf - Ti)/t = K[ ( 80 + 50)/2 - 20]( 80-50)/5 = K[ 65 - 20]6 = K× 45 K = 6/45 = 2/15

in second condition, initial temperature ( Ti) = 60°C Final temperature ( Tf) = 30°C Time taken for cooling is t A/C Newton's law of cooling ( 60 - 30)/t = 2/15 [ (60+30)/2 -20]30/t = 2/15 × 25 30/t = 50/15 = 10/3 t = 9 min

Conductivity= Conductance × cell constant= 1/Resistance × cell constant= 1/31.6 × 0.357 = 0.011 S

Molar conductivity= 1000× conductivity/ Molarity= 1000× 0.011/0.05 = 220S cm² mol^-1

thanx bhai

let max compression is x m ...

m = 1000 kg ....

v = 18 km / hrs = 5 m / s ....

k = 6250 N / m ....

when the car collides wid the spring ..

the energy in car is KE = 1 / 2 * m * v^2...

energy of spring = 1 / 2 * k * x^2..

Now ... 1 / 2 * m * v^2= 1 / 2 * k * x^2

----> 1000 * 25 = 6250 * k^2

----> k^2= 4

----> k = 2 m ... (ans) ...

The direction of friction is not always in the direction of motion in case of rolling. It depends on the net velocity of the lowermost point ,ie, translational velocity of COM – rotational velocity (wR)If v-wR > 0, then friction acts opposite to direction of motionv – wR < 0, then it acts in the direction of motion.

In this question, you can assume either of the two directions of motion because we are applying conservation of energy and the work done by friction woud be same in both cases.

post the complete question and the diagram

sry for this

1

2

3

Heat extracted Q1 from the source is more and heat rejected Q2 to the sink less

The answer will be 200m .he turns after every 200m making an angle of 72° .by the time he take fifth turn he would have made a regular polygon(polygons having equal side and angles )so his displacement will be the last side of polygon form which is going to be 200m.Each of angle of polygon is 72°and in this case side is 200m.

Thestandardheat of neutralization is constant for a strong acid and a strong base.

The strong acid for example HCl is already in ionized form(in polar solvent like water(default)) as H+ and Cl- ions .

Likewise, strong base like NaOH is also in ionized form as OH- ions and Na+ ions.

When you mix them in standard concentrations, the Na+ ions and Cl- ions remain as ions in new mixture but H+ and OH- ions combine to form water.

H+ And OH- gives H2O

The formation of water is exothermic in nature and releases same amount of heat for any strong acod and base as the concentrations of H+ and OH- will be equal in standard concentrations.

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A 60 kg body is pushed horizontally with just enough force to start it moving across a floor and the same force continues to act afterwards. the coefficient of static friction and sliding friction are 0.5 and 0.4 respectively. the acceleration of the body is

here is the solution for a similar ques, just substitute numerical values of your doubt and proceed accordingly-

option 3 is the correct answer

option 3 is correct answer

option 3 is correct

2u is the right answer

thanks mama

As we know that static friction = coefficient of static friction * normal reaction of the bodythat is friction = (u)Nalso N=(m)(g) =20* 10 = 200 N ( By just taking g= 10 m/s^2static friction = 0.7 * 200 = 140 Nwhen the external force will be applied on body .it will be start moving so in this case kinetic friction= 0.6 * 200 = 120 N

so the net force will be difference of both type of friction = 140-120 = 20 Nwe know thatF= ma soa=F/mso by butting values 20/20 =1 m/s^2

option D is the correct answer

d) is the correct answer

c) is the correct answer

If the earth attracts apple the apple also attracts the earth with equal force (in opposite direction) see, at our level its because earth has too much mass as compared to apple and the earth applies not much but some force on apple so it's not possible for earth to move towards apple.

But , theory of general relativity , its clearly said that there is no such thing as gravity , the earth is in a fabric of space time and ground along with everything on it accelerates up.

So , mass of Apple is less and force applied by earth on apple is less so the apple cannot attract the earth toward itself using that much force

Do you want answer with the procedure or particularly the answer ?

Yes u can give answers step by step

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Hard to copy all questions but got top 10 questions from that only for you :question_answer1) When did the French Revolution begin?

Hope you don't mind, I came to a solution for our problem I can send those through Instagram if you want

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Takemetallicball mounted on a insulating stand.

Bring negativelychargedrod near (without touchingit) themetallicball.

Positive chargesare induced near the negativelychargedrod.

Connect themetallicball to the ground.

The negativelychargedelectrons moves to the ground.

Take metallic ball mounted on a insulating stand.

Bring negatively charged rod near (without touching it) the metallic ball.

Positive charges are induced near the negatively charged rod.

Connect the metallic ball to the ground.

The negatively charged electrons moves to the ground.

Disconnect earthing, remove negative recharged rod.

The positive charge gets uniformly distributed in the metallic ball.

x^2=t^2+1

taking its differentiation,

2x*(dx/dt)=2t

x*(dx/dt)=t

again taking differentiation for acceleration,

x*(d^2x/dt^2) + (dx/dt)^2= 1

x*(d^2x/dt^2) = 1 –(dx/dt)^2

x*(d^2x/dt^2) = 1 – (t/x)^2 (becausex*(dx/dt)=t)

(d^2x/dt^2) = (1 – (t/x)^2)/x

(d^2x/dt^2) = 1/x – t^2/x^3

put t2= x2-1

(d2x/dt2) = 1/x3

tarun how can you give the answer in terms of x

Relation between Kelvin and Fahrenheit scale is given by K-273/100=F-32/180

here , The temperature of a body on Kelvin scale is found to be x K and when it is measured by fahrenheit thermometer it is found to be x°F so, put K = x , and F = xso, (x - 273)/100 = (x - 32)/180

(x - 273)/5 = (x - 32)/9

9x - 273 × 9 = 5x - 160

9x - 5x = 2457 - 160

4x = 2297

x = 574.25

Tyndall EffectThe scattering of light in a colloidal solution is an example of Tyndall's effect.

The flatworms, flat worms, Platyhelminthes, Plathelminthes, or platyhelminths are a phylum of relatively simple bilaterian, unsegmented, soft-bodied invertebrates

The flatworms, flat worms, Platyhelminthes, Plathelminthes, or platyhelminths are a phylum of relatively simple bilaterian, unsegmented, soft-bodied invertebrates

Electric intensityis the strength ofelectricfield at a point.Electric intensityat a point is defined as the force experienced. per unit positive charge at a point placed in theelectricfield. or. It may also be also defined as the electrostatic force per unit.

The intensity at the given point will be

E=F/ q ;

So from the given formula the intensity of the given point will be

E= 2000/8*10^-6;

Which is equal to

E= 2.5 *10^8 Newton/coulomb;