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(a) The size of a carriage is very small as compared to the distance between two stations. Therefore, the carriage can be treated as a point sized object.

(b) The size of a monkey is very small as compared to the size of a circular track. Therefore, the monkey can be considered as a point sized object on the track.

(c) The size of a spinning cricket ball is comparable to the distance through which it turns sharply on hitting the ground. Hence, the cricket ball cannot be considered as a point object.

(d) The size of a beaker is comparable to the height of the table from which it slipped. Hence, the beaker cannot be considered as a point object.

Using Volta ge division we can find that 20-Vb/8+Vb/8= 020-Va/4+ Va/3= 0Solving these you will get it

Radius of gyrationis defined as the distance from the axis of rotation to a point where the total mass of the body is supposed to be concentrated, so that the moment of inertia about the axis may remain the same. Simply,gyrationis the distribution of the components of an object.

Radius of gyrationor gyradius refer to the distribution of the components of an object around an axis. In terms of mass moment of inertia, it is the perpendicular distance from the axis of rotation to a point mass (of mass, m) that gives an equivalent inertia to the original object(s) (of mass, m).

Theunitsforradius of gyrationare length (that is millimeters or inches or feet). It is the square root of the moment of inertia I divided by the area A, (I/A)^0.5. I is length^4, A is length^2, (I/A)^0.5 being simply length

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Yes , a electron has dual nature that is of both a partcile and a wave . The wave nature of photon is proved by some phenomena like interference , diffraction etc .

The black body radiation and photoelectric effect could be explained only if particle nature was considered .

when released the ball is in free fallit is no longer subject to the forces of the elevatorsothe ball experiences g (9.81 m/s/s downward)howeversince the boy is accelerating upward with ahe sill see the ball's acceleration as g+a

lift is accelerating frame means non inertial frame so pseudo force will act on ball inside elevatorhence a will be added to g which is acting on ball but direction will be -ve hence w.r.t boy is -(g+a)

can you expect me more clearly. please

TQ

but how can calculate the angle where Angels in the case of tan(alpha)=Bsintheta/A+Bcos theta

It can act both, as an autotroph as it contains chlorophyll and heterotroph as it feed on other substances. Also, in the presence of excess organic matter or darkness, it can act as a saprophytic organism. AsEuglenashows features of both plants and animals, it is adual organism.

The total number of significant figures here is two.

The measurement of length is accurate but not precise.

Yes, it is possible to write 2.6 cm as 2.60cm as both mean the same.

Also, zero is not significant here due to which there will remain no difference between 2.6 cm and 2.60 cm.

(D) is correct option

It is an optical illusion, seen, at sea–shore in winter evening, due to which an image of a ship is seenformedin air in sea–sky. The actual ship is nowhere visible.

Fig.Loomingat cold sea–shore.

Explanation: It is due to total internal reflection and reverberating

If we define acceleration as time rate ofchange in velocity then

for change in magnitude without change in direction:This change can be positive( speeding up) or negative ( speeding down). Up to this I have no objection to the statement.

But, change in direction or change in direction and magnitude both don't allow me to agree with the statement.

Rate of Change of velocity is known as acceleration. If a particle is speeding up or slow down or deceleration, then we can say that the particle is accelerating

Since Lithium 2+ (atomic number Z = 3) and Hydrogen (atomic number Z = 1) both have one electron, you can use the Rydberg equation for the atomic energy levels:

E(n; Z) = -R*(Z^2)/(n^2),

where where R is the Rydberg constant for the atom/ion, Z is the atomic number of the element (the number of protons in the nucleus), and n is the quantum number for that energy level (n = 1, 2, 3, ...). Every element has its own Rydberg constant, but they're all pretty close to 13.6 eV = 2.18 x 10^-18 Joule (1 eV = 1.6 x 10^-19 J). (This energy is relative to E = 0 when the electron becomes completely dissociated from this ion.)

The first excited state of hydrogen is n = 2 (n = 1 is the lowerst-energy, or "ground" state), which from the Rydberg equation has an energy equal to E(n = 2; Z = 1) = -R/4 = -3.4 eV.

The states of Lithium 2+ have energies equal to E(n, Z = 3) = -9R/(n^2). To solve for n (which tells us what excited state the ion is in), we need to equate the hydrogen first-excited state energy with this energy:

-R/4 = -9R/(n^2).

Solving for n gives:

n = sqrt(9 x 4) = sqrt(36) = 6.

So, the n = 6 (fifth excited) state of Li 2+ has the same energy as the n = 2 (first excited) state of hydrogen, according to the Rydberg equation for hydrogen-like (one-electron) atoms.

Bluelight is scattered in all directions by the tiny molecules of air in Earth's atmosphere.Blueis scattered more than other colors because it travels as shorter, smaller waves. This is why we see ablue skymost of the time

Distilled waterisneutralin character, i.e. it is neitheracidicnorbasic.Neutralnature ofdistilled watercan be verified by the use of blue and red litmus paper.Distilled waterdoes not change the colour of either blue or red litmus paper.

b) 55 ° C is the correct answer

b is the answer of the following

option (2) 300

option 2) 300 % k= (p^2)/2m

No they cannotintersecteach other becausetwodifferentequipotential surface have different electric potential, so if theyintersectthen the point ofintersection willhavetwo different potentials at the same point which is not possible.

Fermi level is the highest energy state occupied by electrons in a material at absolute zero temperature. As the temperature is increased, electrons start to exist in higher energy states too.

Fermi level is also defined as the work done to add an electron to the system. More positive (more holes) in a p type semiconductor, mean lesser work needs to be done.

It may be noted that anequipotential surfacemay be thesurfaceof a material body or asurfacedrawn in an electric field. Some important properties ofequipotential surfaces: Work done in moving a charge over anequipotential surfaceis zero. The electric field is always perpendicular to anequipotential surface.

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A surface which has same electrostatic potential at every point on it .is known as equipotential surface.

EQUIPOTENTIAL SURFACES: Anysurface, with same electric potential at every point, is called anequipotential surface. Electric field is always perpendicular to anequipotential surfaceand hence works done in moving a charge between two points on anequipotential surfaceis zero.

The most electrically conductive element issilver, followed by copper and gold

Ans :- equipotential surfacesanysurfacewith same electric potential at every point is called anequipotential surfaceelectric. field is always perpendicular to ane quipotential surfaceand hence work done. in moving a charge between two points on anequipotential surfaceis.

Fermi surface, incondensed-matter physics, abstract interface that defines the allowable energies ofelectronsin a solid.

It is well known that in general conductivity of metals increases with decreasing temperature. Although thereare less electrons that are thermally excited above the Fermi energy to contribute to conduction, the decrease in thermal vibrations that scatters conducting electrons has a larger effect, thus conductivity increases.

Similarly, electrical conductivity of semiconductors increases with increased temperature because there is more thermal energy to excite a greater number of electrons from the valence band to the conduction band. However, as more electrons populate the conduction band the influence of thermal scattering becomes dominant and conductivity begins to decrease like in a metal.

(a) total energy stored in car = 10*2KWH = 20KWH

Car takes 2 KW for 20km/h.

So, t = 20KWH/ 2KW = 10 Hours

(b) Total distance covered = v *t = 20*10 = 200 km.

thanks so much

Scopeof ECengineeringis vast that it is applied in every field. The development of the world that includes every area such as telecommunication, satellite, microelectronics, technology etc are all based onelectronics engineering.

Alens' opticalpower, also called dioptre, is the reciprocal of focal length expressed in metres. Dioptres also define magnifyingpower.Convex lenses, orconverging lenses, would have positive values, as they magnify objects

Unit is dioptre

Power of a convex lens is equal to inverse of its focal distance

Inthermodynamics, areversible processis aprocesswhose direction can be "reversed" by inducing infinitesimal changes to some property of the system via its surroundings. Throughout the entirereversible process, the system is inthermodynamicequilibrium with its surroundings.

Cycle process: A process in which the system after passing through various stages (of pressure volume and temperature changes) returns to its initial state is called a cycle process.

Ans :- Iftwographs xy=a and xy=b aretwographs with a and b astwonon zero constants not equal toeach other, they canneverintersect each otheras the point ofintersectionwould satisfy bother the graphs but product oftwo numbers(co-ordinates of the point of intersection) cannot give 2different answers (a and b).

Milk is poured into a cup of tea and is mixed with a spoon . No this is not a example of reversible process. Because they are mixed with each other and we can not seperate them.

tan−1(1.5166)=56.6°≈57∘

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A process that cannot be retraced back in opposite direction is called irreversible process.Eg : 1) Diffusion of gases 2) Magnetization of material 3) Work done against friction 4) Joule heating – heat produced in a conductor by passing a current through it.

The process in which the system after passing through various stages (or pressure, volume and temperature changes) returns to its initial depends on the state of the system not on the path followed. i) In cyclic process, dU = 0, Hence dQ dW =ii) P – V graph for a cyclic process is a closed curve.

A process that can be retracted back in opposite direction in a such away that the system passes through the same states as in the direct process and finally the system and surroundings return to their original states is called reversible process. Conditions for a process to be reversible:1) The process should be quasi-static. 2) No amount of heat is to be converted into electric (or) magnetic forms of energy. 3) There should be no loss of energy due to conduction, convection (or) dissipation of energy against any resistance like friction, viscosity etc. Example: 1) Pettier effect and see beck effect. 2) Fusion of ice and vaporization of water.

no it only means that the magnitudes of charges are same only the sign is differentthat is positive for protons negative for electron.