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A convex lens is used to obtain a magnified image of an object on a screen 10 cm from the lens. If the magnification is 19, find the focal length of the

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(i) How is the focal length of a spherical mirror affected when it is immersed in water? (ii) A convex lens has 10 cm focal length in air. What is its focal length in water? (Refractive index of air-water = 1.33, refractive index of air-glass =

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A car is moving with at a constant speed of 60 km h–1 on a straight road. Looking at the rear view mirror, the driver finds that the car following him is at a distance of 100 m and is approaching with a speed of 5 km h –1. In order to keep track of the car in the rear, the driver begins to glance alternatively at the rear and side mirror of his car after every 2 s till the other car overtakes. If the two cars were maintaining their speeds, which of the following statement (s) is/are

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Light of wavelength 5000 Å falls on a plane reflecting surface. What are the wavelength and frequency of the reflected light? For what angle of incidence is the reflected ray normal to the incident

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

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For sound waves, the Doppler formula for frequency shift differs slightly between the two situations: (i) source at rest; observer moving, and (ii) source moving; observer at rest. The exact Doppler formulas for the case of light waves in vacuum are, however, strictly identical for these situations. Explain why this should be so. Would you expect the formulas to be strictly identical for the two situations in case of light travelling in a

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

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Answer the following questions: In what way is diffraction from each slit related to the interference pattern in a double-slit

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Answer the following questions: Ray optics is based on the assumption that light travels in a straight line. Diffraction effects (observed when light propagates through small apertures/slits or around small obstacles) disprove this assumption. Yet the ray optics assumption is so commonly used in understanding location and several other

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

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(i) Use Huygens' geometrical construction to show the behaviour of a plane wavefront, (a) passing through a biconvex lens (b) reflected by a concave mirror. (ii) When monochromatic light is incident on a surface separating two media, why does the refracted light have the same frequency as that of the incident

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

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In the above question what is the intensity of light at P if light from `S_1` and `S_2` is same i.e. (I) units. Consider these sources are

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

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Light of wavelength 488 nm is produced by an argon laser which is used in the photoelectric effect. When light from this spectral line is incident on the emitter, the stopping (cut-off) potential of photoelectrons is 0.38 V. Find the work function of the material from which the emitter is

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

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The wavelength of light from the spectral emission line of sodium is 589 nm. Find the kinetic energy at which(i) an electron, (ii) a neutron, would have the same de Broglie

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

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What is the de Broglie wavelength of a ball of mass 0.060 kg moving at a speed of 1.0

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Also find the de Broglie wavelength of a neutron, in thermal equilibrium with matter, having an average kinetic energy of (3/2) k T at 300

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

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Crystal diffraction experiments can be performed using X-rays, or electrons accelerated through appropriate voltage. Which probe has greater energy? (For quantitative comparison, take the wavelength of the probe equal to 1 Å, which is of the order of inter-atomic spacing in the lattice) (me =9.11 × 10–31

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

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Show graphically how the stopping potential for a given photosensitive surface varies with the frequency of incident

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

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Electric charge is uniformly distributed on the surface of a spherical balloon. Show how electric intensity and electric potential vary (a) on the surface (b) inside and (c)

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

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An oil drop of radius r and density `rho` is held stationary in a uniform vertically upwards electric field 'E'. If `rho_0 (< rho)` is the density of air and e is quanta of charge, then the drop

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

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A particle of mass m and charge q is placed r at rest in a uniform electric field E and then released. The kinetic energy attained by the particle after moving a distance y

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

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If the distance between two equal point charges is doubled and their individual charges are also doubled, what would happen to the force between

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Consider `vecE=3×10^3 hati` (N/C) then what is the flux through the square of 10 cm side, if the normal of its plane makes 60° angle with the X

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

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