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Find an expression for intensity of transmitted light, when a polaroid sheet is rotated between two crossed polaroids. In which position of the Polaroid sheet will the transmitted intensity be

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

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Yellow light `(lambda, = 6000 A^o)` illuminates a single slit of width `1xx10^(-4)m`. Calculate the distance between two dark lines on either side to the central maximum, when the diffraction pattern is viewed on a screen kept 1.5 m away from the

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Lighth is coming from medium 1. Some part of light is being refracted and some part is reflectedWhat is the incident wavefront_______refracted

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Light of frequency 7.21 × 1014 Hz is incident on a metal surface. Electrons with a maximum speed of 6.0 × 105 m/s are ejected from the surface. What is the threshold frequency for photoemission of

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What is the de Broglie wavelength of a dust particle of mass 1.0 × 10–9 kg drifting with a speed of 2.2

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A proton, a neutron, an electron and an α-particle have same energy. Then their de Broglie wavelengths compare

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An electron (mass m) with an initial velocity `V=v_0hati(v_0 > 0)` is in an electric field 0 0 ˆ `E = –E_0hati ( E_0constant > 0)` . It’s de Broglie wavelength at time t is given

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

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An electron (mass m) with an initial velocity ` v = v_0hat i` is in an electric field `E=E_0hatj`. If `λ_0 = h/(mv_0)`, it’s de Breoglie wavelength at time t is given

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

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By how much would the stopping potential for a given photosensitive surface goup if the frequency of the incident radiations were to be increased from `4×10^(15) Hz` to `8 × 10^(15) Hz? ` `(h=6.4xx10^(-3)4Js,

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Prove that energy stored per unit volume in a capacitor is given by `1/2∈_o E^2` , where E is the electric field of the

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

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(a) An air filled capacitor is given a charge of 2 µ C raising its potential to 200 V. If on inserting a dielectric medium, its potential falls to 50 V, what is the dielectric constant of the medium?(b) A conducting stab of thickness‘t’ is introduced without touching between the plates of a parallel plate capacitor separated by a distance d (t < d). Derive an expression for the capacitance of a

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

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Figure (a) and (b) shows the field lines of a single positive and negative changes respectively(a) Give the signs of the potential difference : `Vp -Vq and V_B - V_A`(b) Give the sign of the work done by the field in moving a small positive change from Q to P.(c) Give the sign of the work done by the field in moving a small negative change from B to

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

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A square surface of side L. meter in the plane of the paper is placed in a uniform electric field `E ('volt'/m)` acting along the same plane at an angle `theta` with the - horizontal side of the square as shown in Figure. The electric flux linked to

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

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Five point charges, each of value +q are placed on five vertices of a regular hexagon of side Lm. What is the magnitude of the force on a point charge of value –q coulomb placed at the centre of the

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As shown in figure a closed surface intersects a spherical conductor. If a negative charge is placed at point P. What is the nature of the electric flux coming out of the closed surface

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

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A charge `2muC` is taken from infinity to a point in an electric field, without changing its velocity, if work done against electrostatic forces is `–40muJ` then potential at that point is

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

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Prove that the frequency of oscillation of an electric dipole of moment p and rotational inertia I for small amplitudes about its equilibrium position in a uniform electric field strength E is `1/(2pi)

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

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A sphere of radius R has a uniform distribution of electric charge in its volume. At adistance x from its centre, (for x < R), the electric field is directly proportional to

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

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4 Points charges each +q is placed on the circumference of a circle of diameter 2d in such a way that they form a square. The potential at the centre is

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

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