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For stationary waves, the particles of the medium perform-

The magnitude of the induced emf in a coil of inductance 30 mH in which the current changes from 6A to 2A in sec is

निम्न में से कौन नर सहायक ग्रन्थि नहीं है -

Imperfections is optical lenses can be observed with the help of

A rod of height h stands erect on a flat horizontal mirror. Sunrays fall on the mirror at some angle and reflected on to the nearby wall. Find the length of the shadow.

A photon will have less energy if its

Bohr's theory of hydrogen atom didi not explain fully

If an elevator is moving vertically up with an acceleration 'a', the force exerted on the floor by a passenger of mass M is

A dip circle lies initally in the magnetic meridian if it is now rotated throughangle thetain the horizontal plane thentangent of the angle ofd dip is chagedin the ratio

From the above table we can see that the ratio of their atomic masses is 2. But it is not exactly 2. Why is it so ? Explain.

Two slits 0.3mm apart are illuminated by light of wavelength 4500Å. The screen is placed at 1m distance from the slits. Find the separation between the second bright fringe on both sides of the central maximum. Data : d=0.3mm=0.3xx10^(-3)m, lambda=4500Å=4.5xx10^(-7)m, D=1m, n=2, 2x=?

Explain Bohr's atomic model.

Two electric dipoles ,each of dipole moment oversetto p , are enclosed within a closed surface. Total electric flux linked with the surface is _______________

Davisson and Germer's experiment proves the concept of _____.

A berillium particle (z = 4) having 5.3 MeV energy experience head-on collision with gold atom (z = 79). It can move to what closest distance to gold nucleus ?

If radius of curvature of curved surface of plano-convex lens of refractive index 1.5 is 60 cm, then its focal length is ...... cm.

A bettery of emf 10 V and internal resistacne 3 Omega is connected to a resistor. Ifthe current in the circuit is 0.5A, what is the resistance of the resistor ? What is the terminal voltage of the bettery when the circuit is closed ?

In the nth stable orbit of a hydrogen atom, the energy of an electronE =-(13.6)/(n^(2)) eV. Theenergy required to take the electron from first orbit to second orbit will be

The inside and outside temperatures of a refrigerator are 273 K and 303 K respectively. Assume that the refrigerator cycle is reversible. For every joule of work done, the heat delivered to the surrounding will be nearly

What we call the communication process In which space serves as the communication channel?

A 4kg mass is resting on a horizontal surface. For this surface mu_s = 0.6 & mu_(k)= 0.2. Force required to move the body with 5ms^(-2) acceleration is (g = 10ms^(-2))

Predict the direction of induced current in the situations described by the following Figs. 6.03(a) to (f).

For a total intemal reflection, which of the following is correct?

Write down the application of ICT in Fisheries? Fisheries.

A flow of 10^7 electrons per second in a conducting wire constitutes a current of

n identical bulbs operating on same voltage are available. When all such bulbs are connected in series to the same operating voltage source, then power consumed in each bulb = ...... W.

In a series circuit R= 300 Omega, L= 0.9 H, C = 2.0 muF " and " omega= 1000 rad//sec. The impendence of the circuit is

The phenomenon of diffraction of light was discovered by

The voltage gain of the following amplifier is

The diagram shows the energy levels for an electron iin a certain atom. Which transition shown represents the emission of photon with the most energy ?

What is wave packet?Explain by using necessary diagram.

Calculate electric field intensity at point P due to a thin positive uniformly charged rod . Point P is at perpendicular distance d from the rod . The lower and upper ends of the rod make the angles alpha and beta as shown below .

The work done in moving an electric charge q in an electric field does not depend upon

Dimensions of 1/(sqrt(mu_0 in_0)) are

A ray of light traveling in glass (mu_g= 3//2) is incident on a horizontal glass-air surface at the critical angle theta_c . If a thin layer of water (mu_w = 4//3) is now poured on the glass-air surface, at what angle will the ray of light emerges into water at glass-water surface?

(A) : If two beams of protons move parallel to each other in same direction then these beams repel each other. (R) : Like charges repel while opposite charges attract each other.

Velocity of the body on reaching the ground is same in magnitude in the following cases (a) a body projected vertically from the top of tower of height 'h' with velocity 'u'

A body of mass 60 kg is pushed up with just enough force to start it moving on a rough surface with mu_(s)=0.5and mu_(k)=0.4 and the force continues to act afterwards. What is the acceleration of the body ?

In Rutherford experiments on alpha- ray scattering the number of particles scattered at 90^(@) be 29 per minute. Then the number of particles scattered per minute by the same foil, but at 60^(@) is

When you have learned to integrate, derive formule (18.25) from the familiar expression for the field intensity of a point charge.

if y=e^sqrtx ,then dy/dx equals

When does the story takes place?

A 5 kg body is suspended from a spring balance physical balance. If both is balaced on the pan of a physical balance. If both the balances are kept in an elevator then what would happen in each case when the elevator is moving upward acceleration?

During refraction from_____to_____medium.r

a. An electrostatic field line is a continuous curve. That is, a field line cannot have sudden breaks. Why not? b. Explain why two field lines never cross each other at any point?

During refraction from_to_medium.r