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Relativistic corrections become neccssary when the expression for the kinetic energy `1/2mv^2` , becomes comparable with mc2, where m is the mass of the particle. At what de Broglie wavelength will relativistic corrections become important for an

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

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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 ° .

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

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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

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

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Brass has a tensile strength `3.5 × 10^8 N'/'m^2` . What charge density on this material will be enough to break it by electrostatic force of repulsion? How many excess electrons per square Å will there then be? What is the value of intensity just out side the

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

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The two conducting spherical shells are joined by a conducting wire and cut after some time when charge stops flowing.Find out the charge on each sphere after

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

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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

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

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If an electron moves from rest from a point at which potential is 50 volt to another point at which potential is 70 volt, then its kinetic energy in the final state will be

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

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State the number of significant figures in the following : (a) `0.007 m^2` (b) `2.64 × 10^(24) kg` (c) `0.2370 g

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

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(a) State which of the following are dimensionally current(i) Pressure = Energy per unit volume(ii) Pressure = Momentum × volume × time(b) The density of cylindrical rod was measured by the formula:- `P=(4m)/(piD^2I)`The percentage in m, D and l are `1%, 1.5% and 0.5%.` Calculate the % error in the calculated value of

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

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The springs of spring factor k, 2k, k respectively are connected in parallel to a mass m. If the mass = 0.08kg m and k = 2N|m, then find the new time

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

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An infinite line charge produces a field of 9 × 104 N/C at a distance of 2 cm. Calculate the linear charge

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

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The power factor of a good choke coil

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

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The quality factor of LCR circuit having resistance (R) and inductance (L) at resonance frequency `(omega)` is given

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The coil of a choke in a

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

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In the adjoining circuit the voltmeter whose reading will be zero at resonance

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In the adjoining figure the impedance of the circuit will

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The reactance of capacitor is 20 ohm. What does it

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Find out the impedance of given

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What is the magnitude of magnetic force per unit length on a wire carrying a current of 8 A and making an angle of 30º with the direction of a uniform magnetic field of 0.15

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

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A domain in ferromagnetic iron is in the form of a cube of side length 1µm. Estimate the number of iron atoms in the domain and the maximum possible dipole moment and magnetisation of the domain. The molecular mass of iron is 55 g/mole and its density is 7.9 g/cm3 . Assume that each iron atom has a dipole moment of 9.27×10–24 A

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

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