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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

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

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There are materials which absorb photons of shorter wavelength and emit photons of longer wavelength. Can there be stable substances which absorb photons of larger wavelength and emit light of shorter

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

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Consider a metal exposed to light of wavelength 600 nm. The maximum energy of the electron doubles when light of wavelength 400 snm is used. Find the work function in

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

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A student performs an experiment on photoelectric effect, using two materials A and B. A plot of Vstop vs ν is given in Fig. Which material A or B has a higher work

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

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What happens to the capacitance of a capacitor when a dielectric slab is placed between its

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

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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)` =

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

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Three charges `-q_1, +q_2, and -q_3`, are R placed as shown in the figure. The x - component of the force on `-q_1`,

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

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Calculate the electric field at origin due to infinite number of charges as shown in figures

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

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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

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

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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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Electric field in a region is given by `vecE=-4xhati+6yhatj`. The charge enclosed in the cube of side 1m oriented as shown in the diagram is given by `alphaepsilon_0` . Find the value of

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

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Given that `q_1 + q_2 = q` if the between `q_1` and `q_2` is maximum, `q_1/q`

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

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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

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

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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

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

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If electron in ground state of H-atom is assumed in rest then dipole moment of electron proton system of H-atom is ............... . Orbit radius of H atom in ground state is `0.56 A^o`

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

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The electric Potential V at any Point o (x, y, z all in metres) in space is given by `V = 4x^2` volt. The electric field at the point (1m, 0.2m) in volt/metre is

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

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If a charged spherical conductor of radius 10cm has potential v at a point distant 5 cmfrom its centre, then the potential at a point distant 15cm from the centre will be

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

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Two positive point charges of 12µc and 8µc are 10 cm apart each other. The work done in bringing them 4cm closer is

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

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A man walking briskly in rain with speed v must slant his umbrella forward making an angle θ with the vertical. A student derives the following relation between θ and v : tan θ = v and checks that the relation has a correct limit: as v → 0, θ →0, as expected. (We are assuming there is no strong wind and that the rain falls vertically for a stationary man). Do you think this relation can be correct ? If not, guess the correct

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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