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Three forces start acting simultaneously on a particle , moving with velocity, vec(v) . These forces are represented in magnitude and direction by the three sides of a triangle ABC (as shown). The particle will now move with velocity

A radio active isotope has a half - life of 'T' years. How long will it take the activity to reduce to (a) 3.125%(b) 1% of the original value.

How does amount of scattering depend on the wavelength of light used ?

The equation of plane progressive wave motion is y=a sin (2pi)/lamda (vt-x). Velocity of the particle is

A proton accelerated by potential difference 100 V have de-Broglie wavelength of lambda_(0) alpha-particle is accelerated by same potential different.Its de-Broglie wavelength will be ……

Kailash Satyarthi won Nobel Prize for

A particle is subjected simultaneously to two SHMs, one along the x - axis and the other along the y - axis. The two vibrations are in phase and have unequal amplitudes. The particle will execute

A device which converts mechanical energy into electric energy is called as

(ii) If instead of this, the plates of oppositepolarity were joined together, then amount of charge that flows is :

Assertion (A) : If an electron, coming vertically from outer space, enters the earth's magnetic field, it is deflected towards west. Reason (R) : Electron has negative charge.

what is frequency of red light when wavelength of light is 7500 A^@.

An equilateral triangle ofside length 1 is formed from a piece of wire of uniform resistance. The current I is as shown in figure. Find the magnitude of the magnetic field at its center O.

Isotones are the nuclides which contain ............... .

Binding energy of deuterium is 2.23MeV. Mass defect in amu is

If the K.E. of free electron doubles, its de-Broglie wavelength changes by the factor

The virtual current of 4 A and 50 Hz flows in an AC circuit contaning a coil. The power consumed in the coil is 240 W. If the virtual voltage across the coil is 100 V, then its resistance will be

From the condition of the foregoing problem find: (a) normalized eigenfunctions of the particle in the states for which Psi(r ) depends only on r , (b) the most probable value r_(pr) for the ground state of the particle and probability of the particle to be in in the region r lt r_(pr)

Which of the following four alternatives is not correct? We need modulation

Who established the fact of animal electricity ?

A thin wire of radius ..r.. carries a charge q. Find the magnitude of the electric field strength on the axis of the ring as a function of distance L from the centre. Find the same for L gt gt r Find maximum field strength and the corresponding distance L.

When light of wavelenght lambda is incident on an equilateral prism kept in its minimum deviation position, it is found that the angle of deviation equals the angle of the prism itself. The refractive index of the material of the prism for the wavelenght lambda is, then

Find the total heat produced in the loop of the previous problem during the interval 0 to 5 s

Write the difference between isotope and isobars.

Suppose the rest length of the box in figureis 30 light seconds. The train T_1 travels at a speed of 0.8c. Find the time elapsed between opening of D_1 and D_2 in the frame of T_1.

A stationary particle explodes into two particles of masses m_1 and m_2 which move in opposite directions with velocities v_1 and v_2.The ratio of their K.E E_1//E_2 is:

In a metre bridge the null point is found at a distance of 60.0 cm from A. If now a resistance of 5Omega is connected in series with S, the null point occurs at 50 cm. Determine the values of R and S.

An element vec(Delta) = Delta x hati is placed at the origin as shown (fig.) and carries a current I = 2 A . Find out the magnetic field at a point p on the y-axis at a distance of 1.0 m due to the element Delta x = 1 cm. Give the direction of the field produced.

Five particles undergo damped harmonic motion. Value for the spring constant k, the damping constantb, ad the mass m are given below. Which leads to the smallest rate of loss of mechanical energy?

In the figure given below there is one parallel plate capacitor with two types of dielectric materials in between the plates. Calculate net capacitance of the given system.

In the circuit shown, the energy stored in 1muF capacitor is

State Boyle's law. Derive it on the basis of the kinetic theory of an ideal gas.

Two balls have the same size but one is denser than the other. Assume the air resistance to be same on each, show that when they are released simultaneously from the same height, the heavier ball will reach the ground first.

What is the magnification in this case?

The hysteresis loop of a soft iron piece has a much smaller area than that of a carbon steel piece . If the material is to go through repeated cycles of magnetisation , which piece will dissipate greater heat energy ?

In a common base configuration I_c=1muA,alpha=0.95, the value of base current is

Weightlessness in a satellite is due to the

A simple pendulum oscillates in a verticle plane. When it passes through the mean position,the tension in the string is 3 times the weight of the pendulum bob. What is the maximum angular displacement of the pendulum of the string with respect to the vertical ?

Differentiate each function by applying the basic rules of differentiation (2x)/(7x-1)

The maximum intensity in the interference pattern of two equal and parallel slits is I. If one of the slits is closed the intensity at the same point is 1_(0). Then ______.

The potential barrier of 0.5 V exist across a p-n junction. If the dpletion region is 5.0xx10^(-7)m wide, then the intensity of electric field in this region is ………….

Resistance of conductor increases with increase in temperature because ....

At breakdown voltage the reverse current of p-n junction can be ranked mA ……. .

The susceptibilityof a magnetic material is 0.9853Identify the type of magnetic material .Draw the modification of the field pattern on keeping a piece of this material in a uniform magnetic field.

In specific resistance measurement of a wire using a meter bridge, the key k in the main circuit is kept open when we are not taking readings. The reason is

What is the resistance to be connected in series with a condenser of a capacity 5muF so that the phase difference between the current and the applied voltage is 45^(@) when the angular frequency of the applied voltage is 400 rads^(-1)