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Draw the wavefront coming out from a convex lens, when a point source of light is placed at its

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

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(i) In a double slit experiment using ight of wavelength 600 nm, the angular width of the fringe formed on a distant screen is 0.1°. Find the spacing between the two slits.(ii) Linght of wavelength `5000A^o` propagating in air gets partly reflected from the surface of water. How will the wavelengths and frequencies of the reflected and refracted light be

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(i) Using Huygens' construction of secondary wavelets explain how a diffraction pattern is obtained on a screen due to a narrow slit on which a monochromatic beam of light is incident normally.(ii) Show that the angular width of the irst diffraction fringe is half that of the central fringe.(iii) Explain why the maxima at `theta=(n+1/2)lambda/a` become weaker and weaker with increasing

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How would the angular separation of interference fringes in Young's double slit experiment change when the distance between the slits and screen is

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How will the interference pattern in Young's double slit experiment get affected, when(i) distance between the slits `S_1 and S_2` reduced and (ii) the entire set up is immersed in water? Justify your answer in each

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

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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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When coherent waves (a) same phase(b) same frequency(c) same phase difference(d) same path

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In an accelerator experiment on high-energy collisions of electrons with positrons, a certain event is interpreted as annihilation of an electron-positron pair of total energy 10.2 BeV into two γ-rays of equal energy. What is the wavelength associated with each γ-ray? (1BeV = 109

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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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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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Draw one equipotential surfaces (1) Due to uniform electric field (2) For a point charge (q <

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The Plates of a charged capacitor are connected by a voltmeter. If the plates of the capacitor are moved further apart. What will be the effect on the reading of the

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

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Keeping the voltage of the charging source constant. What would be the percentage change in the energy stored in a parallel plate capacitor if the separation between its plates were to be decreased by

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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

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

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A system has two charges `q_A=2.5×10^(–7) C and q_B = – 2.5 × 10^(–7) C` located at points `A: (0, 0, – 0.15 m) and B ; (0, 0, + 0.15 m)` respectively. What is the total charge and electric dipole moment of the

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

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Two conducting plates A and B are placed parallel to each other. A is given a charge `Q_1 and B` a charge `Q_2` . Prove that the charges on the inner facing surfaces are of equal magnitude and opposite sign. Also find the charges on inner & outer

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Four charges are placed at the circumference of a dial clock as shown in figure. If the clock has only hour hand, then the resultant force on a charge `q_0` placed at the centre, points in the direction which shows the time as

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Uniform electric field of magnitude 100 V/m in space is directed along the line `y= 3 + x`. Find the potential difference between point `A (3, 1) & B

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

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