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If an electron in any hydrogen atom jumps from an orbit n_(i)=3 to an orbit with level n_f= 2, the frequency of the emitted radiation is :

Carbon, silicon and germanium have four valence electrons each . At room temperature which one of the following statements is most appropriate ?

One requires an energy E_nto remove a nucleon from nucleus and an energy E_cto remove an electron from an atom. then

Two infinitely long parallel wires 5 cm apart in air carry currents of 2A and 4A respectively. Find the magnitude of the force on each metre of wire if currents are (i) in the same direction. (ii) in opposite direction.

Into what number of sublevels are the following terms split in a weak magnetic field: (a).^(3)P_(0),(b) .^(2)F_(5//2),(c ) .^(4)D_(1//2) ?

A stationary sound wave has frequency 165 Hz (speed of sound in air = 330 m/s), then distance between two consecutive nodes is :

Two non-ideal identical batteries are connected in parallel. Consider the following statements (i) The equivalent e.m.f. is smaller than either of the two e.m.f.s (ii) The equivalent internal resistance is smaller than either of the two internal resistances

The radius of hydrogen atom, in the ground state is of the order of

A person move 30m north, then 30m east, then 30 sqrt 2 m south west. His displacement from the original position is

The dimensional formula of dielectric strength is…….

A dipole consisting of +10 nC and -10 nC separated by a distance of 2cm oscillates in an electric field of strength 60,000 Vm^(-1). The frequency of its oscillation is (M.I. about the axis of oscillations is 3 xx 10^(-10)kg m^(2))

The binding energy of a hydrogen molecule is 4.75 eV. Energy required to dissociate 0.05% of hydrogen gas at NTP occupying volume 5.6 litres is :

Two mutually perpendicular wire carry charge densities lambda_1 and lambda_2. The electric lines of force makes angle alpha with second wire, then lambda_1//lambda_2 is

Two insulated metal spheres of different capacitances charged to different potentials are joined together by a wire so as to share their charges. What happens to the total electrical energy of the system?

What is the function of soft iron cylinder in a moving coil galvanometer ?

A body is projected at angle 30^@ to the horizontal with speed 30m/s. What will be the angle the horizontal after 1.5 seconds.

Assuming the expression for radius of the orbit, derive an expression for total energy of an electron in hydrogen atom.

A ray of light is incident on a glass plate at 60^@. The reflected and refracted rays are found to be mutually perpendicular. The refractive index of the glass is :

The arms of a deflection magnetometer in thetan Bposittion are placed

What is a light emitting diode? Write an advantage of using it over conventional low power lamps.

The acceleration due to gravity is directly proportional to velocity of the planet.Is it true?

A circular coil of 5 turns and of 10 cm mean diameter is connected to a voltage source. If the resistance of the coil is 10Omega , the voltage of the source so as to nullify the horizontal component of the earth's magnetic field at 30 A turn m^(-1) at the center of the coil should be

In an electron microscope, the electrons are accelerated by a voltage of 14 kV. If the voltage is changed to 224 kV, then the de Broglie wavelength associated with the electrons would……………

Who's oceans are black with oil?

In an L-R circuit connected to a battery of constant emf E, switch is closed at time t =0. If en denotes the induced emf across the inductor and i the current in the circuit at any time t. Then the graph shows the correct variation of .e. with .i. is

यदि y=t^(4/3) -3t^(-2/3) to dy/dt=

Chromosomes are made up of

What was grandmother's routine in the city?

Two balls A & B of mass m_(1) and m_(2) are kept on a horizontal smooth surface. A is given a velocity towards B so that they perform head on collision

An atom has a nearly continuous mass distribution in a ....... but has a highly non-uniform mass distribution in .. . (Thomson's model/ Rutherford's model.)

Does the apparent depth of a tank of water changes when viewed obliquely.

Two coherent monochromatic light sources are located at two vertices of an equilateral triangle. If the intensity due to each of the source independently is 1 Wm^(-2) at the third vertex. The resultant intensity due to both the source at that point (i.e. at the third vertex) is (in Wm^(2)).

In a musical scale,the following interval is known as a major tone

The equation of travelling wave is y = 60 cos (1800 t - 6x) , where y is in microns, t in seconds and x in metres. The ratio of maximum particle velocity to velocity of wave propagation is :

Eddy current are produced when.

What is the difference of angular momenta of an electron between two consecutive orbits in hydrogen atom?

When a current flows through a conductor, its temperature

Range of the function f(x) = 1+x^2 /x^2

The moment of inertia of a solid sphere of mass M and radius R, about an axis through its centre, is (2)/(5)MR^(2). The moment of inertia about an axis tangential to the surface of the sphere will be :

Two wires X, Y have the same resistivity, but their cross-sectional areas are in the ratio 2:3 and lengths in the ratio 1:2. They are first connected in series and then in parallel to a d.c. source. Find out the ratio of the drift speeds of the electrons in the two wires for the two cases.

For a body travelling with uniform acceleration ration ,its final velocity is v=sqrt(180-7x), where x is the distance travelled by the body.Then the acceleration is

A uiform ring of mass M and radius R is placed directly above a uniform sphere of mass 8M and same radius R. The centre of the sphere. The gravitational atraction between the sphere and the ring is

Let(1+X^(2))^(2)(1+X)^(n)=sum_(k=0)^(n+4)a_(k)X^(k).ifa_(1),a_(2),a_(3)are in arithmetic progression then possible value (s) of n is/are :

A train moves from rest with acceleration alpha and in time t_(1) covers a distance x. It then decelerates rest at constant retardation beta for distance y in time t_(2). Then

Show that two waves interfere constructively when the path difference them is an integral multiple of wave length.