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State Huygens' principle and prove the laws of reflection on the basis of wave theory.

Charged of +6 nC and -15n C,when separated by a certain distance , attract each other by a force F. If an additional charges of + 9 muCis given to each of the two charges and separation between them is kept unchanged, the force between them will still be an attractive force of magnitude F.

The light rays which suffers a single TIR is

What one gets from velocity time graph?

Determine the electric field strength vector if the potential of this field depends on (x, y, z) co-ordinates as V=A(x^(2)-y^(2)).

Assertion The frequency of the electromagnetic wave naturally equals equals the frequency of oscillations of the charge. Reason The energy associated with the propagating wave comes at the expense of the energy of the source.

Three concentric conducting spherical shells of radii R, R2 and 3R carry charges Q,-2Q and 3Q, respectively compute the electric field at r = (5)/(2) R

The electric chargesare distributed in a small volume. The flux of the electric field through a surface of radius 10 cm surrounding the total charge is 20 Vm. The flux over a concentric sphere of radius 20 cm will be

Two capacitors of capacitance 600 pF and 900 pF are connected in series across a 200 V supply .Calculate the effective capacitance of the combination.

The gravitational force exerted by the sun on the moon is greater than that exerted by the earth on the moon. Why then does not the moon escape from the earth.

Two boys are standing at the ends A and B of a ground where AB= a. The boy at B starts running in a direction perpendicular to AB with velocity v. The boy at A starts running simultaneously with velocity v and catches the other in a time t, where t is

Two capacitors of capacitance 600 pF and 900 pF are connected in series across a 200 V supply .Calculatethe pd across each capacitor .

Two capacitors of capacitance 600 pF and 900 pF are connected in series across a 200 V supply .Calculatethe total charge stored in the system.

The difference in mass of nucleus and the combined mass of electrons is called______.

In an accelerator experiment on high energy collisions of electrons with positron, a certain event is interprected as annihilation of an electron-positron pair of total energy 10.2 BeV into two gamma-rays of equal energy. What is the wavelength associated with each gamma-ray ? (1 BeV=10^(9)eV)

In Fig. 6-52, two blocks, in contact, slide down an inclined plane AC of inclination 30^(@) . The coefficient of kinetic friction between the 2.0 kg block and the incline is u_(1)=0.20 and that between the 4.0 kg block and the incline is mu_(2)=0.30. Find the magnitude of the acceleration.

Find the distance of object from a concave mirror of focal length 10 cm so that image size is four time the size of the object.

The modulation index in Amplitude modulating, value is

Assertion:There occurs a chain reaction when uranium is bombardedwith slow neutrons. Reason:When uranium is bombarded with slow neutrons more neutrons are produced

The power of a transmitter 19 kW. The power of the Carrier wave is , if the amplitude of modulated wave is 10 V and that of Carrier is 30V,

An explosion of atomic bomb release an energy of 7.6 xx 10^13J. If 200 Mev energy is released on fission of one .^235U atom calculate (i) the number of uranium atoms undergoing fission, (ii) the mass of uranium used in the bomb.

For which position of the object, magnification of convex lens is -1. (minus one)?

A piece of copper and another of germanium are cooled to 77K , the resistance of :

L = 8.1 mH, C = 12.5 muF and R = 100 Omega are connected in series with A.C. source of 230 V and frequency 500 Hz. Calculate voltage across two ends of resistance.

there in no current part of this circuit for time t lt o. Switch S is closed at t = 0. Current through the 6 Omega resistor

A digital signal possesses:

A flexible chain of weight W hangs between two fixed points A & B which are at the same horizontal level. The inclination of the chain with the horizontal at both the points of support is theta . What is the tension of the chain at the mid point ?

A coil of 100 turns having an average area of 100cm^2 for each turn is held in a uniform field of 50 gauss, the direction of field being at right angles to the plane of coil. The field is removed in 1/100 sec. Average e.m.f. (in volt) induced in coil is:

The fraction of world's human population using the services of internet is

A small solid sphere of radius r rolls down an incline without slipping which ends into a vertical loop of radius R. Find the height above the base so that it just loops the loop

Half the surface of atransparent sphere of refractive index 2 is silvered. A narrow, paralel beam of light is incident on the unsilvered surface, symmetrically with respect to the silvered part. The light finally emerging from theh sphere will be a

A spherical mirror froms an erect image three times the size of the object . if the distance between the object and the image is 100cm/sec . What is the velocity of image at that instant ?

Dispersive power ofprism is the ratio between the angular dispersion to_____.

A 500 g block rests on a frictionless horizontal table at a distance of 400 nm from a fixed pin O. Then block is attached to pin O by an elastic cord of constant k = 100 N//m & of underformed length 900 mm. If the block is set in motion perpendiculariy as shown

What we call the phenomenon of change in path of light without change in medium ?

The value of electric potential at the surface of a charged conductor is 10V. Find the value of intensity of electric field and potential at a point interior to it.

A wave progagates on a string in the positive x-direction at a velocity v. The shape of the string at t = t, is give by f(x ,t_0) = A sin(x//a). Write the wave equation or a general time t

Drawings I and II show two samples of electric field lines

A conducting sphere of radius R, and carrying a charge Q , is joined to an uncharged conducting sphere of radius 2 R . The charge flowing between them will be :

The mass number "A" of a nucleus is related to surface area "X" of nucleus as -

Three resistance 2 Omega , 3Omegaand 5 Omega are connected in parallel and a p.d. of 30V is applied across the terminals ofcombination. The current flowing through 6 Omegaresistance is

The half life of a radioactive substance is 20 minutes, The time taken between 50% decay and 87.5% decay of the substance will be

The magnetic dipole moment of a current carrying coil is independent of the_____ of the magnetic field.

Two ions having masses in the ratio 1 : 2 and charges 1 : 2 are projected into uniform magnetic field perpendicular to the field with speeds in the ratio 2 : 3. The ratio of the radii of circular paths along which the two particles move is

In Foucoult's method of determining the velocity of light, the distance between the rotating mirror and the concave mirror is made to pass along a tube of water (mu = 1.33) instead of air, the displacement is

A proton of charge 1.6 xx 10^(-19)C" and mass "1.67 xx 10^(-27)kg is accelerated from rest in air through a p.d. of 1000 volts. Calculate its final speed.