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An electron and a photon each have a wavelength of 1.00 nm. Find their

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Estimating the following two numbers should be interesting. The first number will tell you why radio engineers do not need to worry much about photons! The second number tells you why our eye can never ‘count photons’, even in barely detectable light. The number of photons emitted per second

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Two particles A1 sand A2 of masses m1, m2 (m1 > m2) have the same de Broglie wavelength.

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A particle moves in a closed orbit around the origin, due to a force which is directed towards the origin. The de Broglie wavelength of the particle varies cyclically between two values λ1, λ2 with λ1>λ2. Whichof the following statement are

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Two particles A and B of de Broglie wavelengths λ1 and λ2 combine to form a particle C. The process conserves momentum. Find the de Broglie wavelength of the particle C. (The motion is one

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Consider an electron in front of metallic surface at a distance d (treated as an infinite plane surface). Assume the force of attraction by the plate is given as `1/4q^2/(4piε_0d^2)` Calculate work in taking the charge to an infinite distance from the plate. Taking d = 0.1nm, find the work done in electron volts. [Such a force law is not valid for d <

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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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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

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A semi-circular arc of radius ‘a’ is charged uniformly and the charge per unit length is A. The electric field at the centre of this arc

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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The arrangement shown consists of three elements. (i) A thin rod of charge `–3.0 muC` that forms a full circle of radius 6.0 cm. (ii) A second thin rod of charge `2.0 muC` that forms a circular arc of radius 4.0 cm and concentric with the full circle, subtending an angle of 90° at the centre of the full circle. (iii) An electric dipole with a dipole moment that is perpendicular to a radial line and has magnitude `1.28 × 10^(–21)C-m.` Find the net electric potential in volts at the

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 .........

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Three charges, each of value Q, are placed at the vertex of an equilateral triangle. A fourth charge q is placed at the centre of the triangle. If the charges remains stationery then, q =

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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

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Starting from the centre of the earth having radius R, the variation of g (acceleration due to gravity) is shown by which of the following option

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

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When 100 volt dc is applied across a coil, a current of 1A flows through it. When 100 volt ac at 50 cyle `s^(-1)` is applied to the same coil, only 0.5 A current flows. The impedance of the coil

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Calculate impedance of the given circuit :

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A 3.0 cm wire carrying a current of 10 A is placed inside a solenoid perpendicular to its axis. The magnetic field inside the solenoid is given to be 0.27 T. What is the magnetic force on the

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The earth’s magnetic field at the equator is approximately 0.4 G. Estimate the earth’s dipole

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Answer the following questions regarding earth’s magnetism: If you made a map of magnetic field lines at Melbourne in Australia, would the lines seem to go into the ground or come out of the

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

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