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Let us list some of the factors, which could possibly influence the speed of wave propagation: (i) nature of the source. (ii) direction of propagation. (iii) motion of the source and/or observer. (iv) wavelength. (v) intensity of the wave. On which of these factors, if any,

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

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Answer the following questions: In a single slit diffraction experiment, the width of the slit is made double the original width. How does this affect the size and intensity of the central diffraction

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

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

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Define a wavefront. Use Huygens' geometrical construction to show the propagation of plane wavefront from a rarer medium (1) to a denser medium (2) undergoing refraction, hence derive Snell's law of

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

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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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Draw a new wavefornt from the given incident

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What is the de Broglie wavelength of a bullet of mass 0.040 kg travelling at the speed of 1.0

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

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For what kinetic energy of a neutron will the associated de Broglie wavelength be 1.40 × 10–10

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

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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

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

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Monochromatic radiation of wavelength 640.2 nm (1nm = 10–9 m) from a neon lamp irradiates photosensitive material made of caesium on tungsten. The stopping voltage is measured to be 0.54 V. The source is replaced by an iron source and its 427.2 nm line irradiates the same photo-cell. Predict the new stopping

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

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Obtain the de Broglie wavelength associated with thermal neutrons at room temperature (27 °C). Hence explain why a fast neutron beam needs to be thermalised with the environment before it can be used for neutron diffraction

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

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The wavelength of a probe is roughly a measure of the size of a structure that it can probe in some detail. The quark structure of protons and neutrons appears at the minute length-scale of 10–15 m or less. This structure was first probed in early 1970’s using high energy electron beams produced by a linear accelerator at Stanford, USA. Guess what might have been the order of energy of these electron beams. (Rest mass energy of electron = 0.511

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

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Find the typical de Broglie wavelength associated with a He atom in helium gas at room temperature (27 °C) and 1 atm pressure; and compare it with the mean separation between two atoms under these

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

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Answer the following questions: Every metal has a definite work function. Why do all photoelectrons not come out with the same energy if incident radiation is monochromatic? Why is there an energy distribution of

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

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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

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

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There are two sources of light, each emitting with a power of 100 W. One emits X-rays of wavelength 1nm and the other visible light at 500 nm. Find the ratio of number of photons of X-rays to the photons of visible light of the given

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

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A parallel plate capacitor with air between the plates has a capacitance of 8 pF `(1pF = 10^(-12) F)`. What will be the capacitance if the distance between the plates is reduced by half and the space between them is filled with a substance of dielectric constant

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

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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

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

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Two identically charged spheres are suspended by strings of equal length. The strings make an angle of 300 with each other. When suspended in a liquid of density 0.8 g/cc the angle remains same. What is the dielectric constant of liquid. Density of sphere = 1.6

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

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