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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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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 D is turned

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

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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 can distinguish which of the sources B or D has been

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

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The optical properties of a medium are governed by the relative permitivity (`ε_r`) and relative permeability (`μ_r` ). The refractive index is defined as `sqrt(μ_rε_r) = n` .For ordinary material `ε_r` > 0 and `μ_r` > 0 and the positive sign is taken for the square root. In 1964, a Russian scientist V. Veselago postulated the existence of material with `ε_r` < 0 and `μ_r` < 0. Since then such ‘metamaterials’ have been produced in the laboratories and their optical properties studied. For such materials `n = -sqrt(μ εr r)` . As light enters a medium of such refractive

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

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The optical properties of a medium are governed by the relative permitivity (`ε_r`) and relative permeability (`μ_r` ). The refractive index is defined as `sqrt(μ_rε_r) = n` .For ordinary material `ε_r` > 0 and `μ_r` > 0 and the positive sign is taken for the square root. In 1964, a Russian scientist V. Veselago postulated the existence of material with `ε_r` < 0 and `μ_r` < 0. Since then such ‘metamaterials’ have been produced in the laboratories and their optical properties studied. For such materials `n = -sqrt(μ εr r)` . As light enters a medium of such refractive

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

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To ensure almost 100 per cent transmittivity, photographic lenses are often coated with a thin layer of dielectric material. The refractive index of this material is intermediated between that of air and glass (which makes the optical element of the lens). A typically used dielectric film is MgF2 (n = 1.38). What should the thickness of the film be so that at the center of the visible speetrum (5500 A o ) there is maximum transmission.

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

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Monochromatic light of frequency 6.0 ×1014 Hz is produced by a laser. The power emitted is 2.0 ×10–3 W. What is the energy of a photon in the light

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

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Monochromatic light of frequency 6.0 ×1014 Hz is produced by a laser. The power emitted is 2.0 ×10–3 W. How many photons per second, on an average, are emitted by the

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

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The work function of caesium is 2.14 eV. Find the threshold frequency for

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

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The work function of caesium is 2.14 eV. Find the wavelength of the incident light if the photocurrent is brought to zero by a stopping potential of 0.60

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

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The wavelength of light in the visible region is about 390 nm for violet colour, about 550 nm (average wavelength) for yellowgreen colour and about 760 nm for red colour. What are the energies of photons in (eV) at the (i) violet end, (ii) average wavelength, yellow-green colour, and

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

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The wavelength of light in the visible region is about 390 nm for violet colour, about 550 nm (average wavelength) for yellowgreen colour and about 760 nm for red colour. From which of the photosensitive materials with work functions listed in Table 11.1 and using the results of (i),

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

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What is the de Broglie wavelength associated with an electron moving with a speed of 5.4×106

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What is the de Broglie wavelength associated with a ball of mass 150 g travelling at 30.0

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An electron, an α-particle, and a proton have the same kinetic energy. Which of these particles has the shortest de Broglie

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

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A particle is moving three times as fast as an electron. The ratio of the de Broglie wavelength of the particle to that of the electron is 1.813 × 10–4. Calculate the particle’s mass and identify the

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

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What is the de Broglie wavelength associated with an electron, accelerated through a potential differnece of 100

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Find the(i) maximum frequency,(ii) minimum wavelength of X-rays produced by 30 kV

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The work function of caesium metal is 2.14 eV. When light of frequency 6 ×1014Hz is incident on the metal surface, photoemission of electrons occurs. What is the(i) maximum kinetic energy of the emitted electrons,(ii) Stopping potential,(iii) maximum speed of the emitted

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The photoelectric cut-off voltage in a certain experiment is 1.5 V. What is the maximum kinetic energy of photoelectrons

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

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