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What is the shape of the wavefront in each of the following cases: Light diverging from a point

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What type of wavefront will emerge from a (i) point source (ii) distant light

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Use Huygens' principle to show how a plane wavefront propagates from a denser to rarer medium. Hence, verify Snell's law of

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

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Using Huygens' principle, draw a diagram showing how a plane wave gets refracted, when it is incident on the surface separating a rarer medium from a denser medium. Hence, verify Snell's laws of

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Four identical monochromatic sources A,B,C,D as shown in the (Fig.) produce waves of the same wavelength λ and are coherent. Two receiver R1 and R2 are at great but equal distaces from B. Which of the two receivers picks up the larger signal when B is turned

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

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(i) A monoenergetic electron beam with electron speed of 5.20 × 106 m s–1 is subject to a magnetic field of 1.30 × 10–4 T normal to the beam velocity. What is the radius of the circle traced by the beam, given e/m for electron equals 1.76 × 1011C kg–1 .(ii) Is the formula you employ in (i) valid for calculating radius of the path of a 20 MeV electron beam? If not, in what way is it modified? [Note: Exercises 20(ii) and 21(ii) take you to relativistic mechanics which is beyond the scope of this book. They have been

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

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Light of intensity 10–5 W m–2 falls on a sodium photo-cell of surface area 2 cm2 . Assuming that the top 5 layers of sodium absorb the incident energy, estimate time required for photoelectric emission in the wave-picture of radiation. The work function for the metal is given to be about 2 eV. What is the implication of your

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Ultraviolet light is incident on two photosensitive materials having work function `φ_1 and φ_2 (φ_1 > φ_2 )`. In which of the case will K.E. of emitted electrons be greater?

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The wavelength λ of a photon and debroglie wavelength of an electron have the same value. Show that the energy of the photon is `(2mcλ)/h` times the kinetic energy of electron where m, c, and h have their usual

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Two dielectric slabs of dielectric constant K1 and K2 are filled in between the two plates, each of area A, of the parallel plate capacitor as shown in the figure. Find the net capacitance of the capacitor? Area of each plate =

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A solid conducting sphere of radius a has a net positive charge 2Q. A conducting spherical shell of inner radius b and outer radius c is concentric with the solid sphere and has a net charge– Q.The surface charge density on the inner and outer surfaces of the spherical shell will be

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A charge q is placed at the centre of the open end of a cylindrical vessel. The flux of the electric field through the surface of the vessel is

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A hollow cylinder has a charge q coulomb within it. If `phi` is the electric flux in units of voltmeter associated with the curved surface B, the flux linked with the plane surface A in units of voltmeter will

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For the system shown in figure find Q for which resultant force on q is

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An uncharged conductor of inner radius `R_1` and outer radius `R_2` contains a point charge q at the centre as shown in figure.(i) Find `vecE and V` at points `A,B and C`.(ii) If a point charge Q is kept out side the sphere at a distance `‘r’ ( > > R_2)` from centre then find out resultant force on charge Q and charge

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Two equal negative charges –q are fixed at points (o, a) and (o, –a) on the Y axis. Apositive charge q is released from rest at the point `x (x < < a)` on the X-axis, then thefrequency of motion is

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A conducting wire XY of mass m and neglibile resistance slides smoothly on two parallel conducting wires as shown in Fig . The closed circuit has a resistance R due to AC. AB and CD are perfect conductors. There is a magnetic field` B = B(t )hatk` . Write

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Find the current in the sliding rod AB (resistance = R) for the arrangement shown in Fig . B is constant and is out of the paper. Parallel wires have no resistance. v is constant. Switch S is closed at time t =

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

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A long solenoid ‘S’ has ‘n’ turns per meter, with diameter ‘a’. At the centre of this coil we place a smaller coil of ‘N’ turns and diameter ‘b’ (where b < a). If the current in the solenoid increases linearly, with time, what is the induced emf appearing in the smaller coil. Plot graph showing nature of variation in emf, if current varies as a function of mt2 +

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Consider the LCR circuit shown in Fig . Find the net current i and the phase of i. Show that ` I=Z/V` . Find the impedence Z for this

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

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