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Answer the following questions: Why should gases be insulators at ordinary pressures and start conducting at very low

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Consider Fig. Suppose the voltage applied to A is increased. The diffracted beam will have the maximum at a value of θ that

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Photons absorbed in matter are converted to heat. A source emitting n photon/sec of frequency ν is used to convert 1kg of ice at 0°C to water at 0°C. Then, the time T taken for the

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In the explanation of photo electric effect, we asssume one photon of frequency ν collides with an electron and transfers its energy. This leads to the equation for the maximum energy `E_max` of the emitted electron as `E_max = hν – φ_0` where` φ_0` is the work function of

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Consider a 20 W bulb emitting light of wavelength 5000 A ° and shining on a metal surface kept at a distance 2m. Assume that the metal surface has work function of 2 eV and that each atom on the metal surface can be treated as a circular disk of radius 1.5 A ° .

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Electron and proton are moving with same speed, which will have more

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Photoelectric work function of a metal is 1eV. Light of wavelength `3000A^o` falls on it. What is the velocity of the effected

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A steam of electrons travelling with speed `υ m/s` at right angles to a uniform electric field E is deflected in a circular path of radius r. Prove that `e/m=v^2/(rE)` =

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`10^(12) alpha` – particles (Nuclei of helium) per second falls on a neutral sphere, calculate time in which sphere gets charged by

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A charged particle is kept in equilibrium in the electric field between the plates of millikan oil drop experiment. If the direction of the electric field between the plates is reversed, then calculate acceleration of the charged

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For infinite line distribution of charge draw the curve between log E and log

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`1muC` charge is shifted from A to B and it is found that work done by external force is `80muJ` against electrostic forces, find `V_A –

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Prove that if an isolated (isolated means no charges are near the sheet) large conducting sheet is given a charge then the charge distributes equally on its two

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Two conducting hollow spherical shells of radii `R and 2R` carry charges – Q and 3Q`` respectively. How much charge will flow into the earth if inner shell is grounded

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The rate of alpha partical falls on neutral spheare is `10^(12)` per second. The time in which sphere gets charged by 2µc is .........

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A charge Q is divided into two parts and then they are placed at a fixed distance. The force between the two charges is always maximum when the charges are

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Three charges –`q_1 , + q_2 `and `–q_3` are placed as shown in figure. The x component of the force on –q1 is proportional to

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Four charges, each equal to –Q, are placed at the corners of a square and a charge +q isplaced at its centre. If the system is in equilibrium, the value of q is

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Two point positive charges q each are placed at (–a, o) and (a, o). A third positive charge qo is placed at (o, y). For which value of y the force at qo is maximum

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The electron is projected from a distance d and with initial velocity `υ_o` parallel to a uniformly charged flat conducting plate as shown in figure. It strikes the plate after travelling a distance l along the direction. The surface charge density of conducting plate is equal

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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