Recent questions tagged marks3

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Show that the wavelength of electromagnetic radiation is equal to the de Broglie wavelength of its quantum

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

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What is the de Broglie wavelength of a nitrogen molecule in air at 300 K? Assume that the molecule is moving with the root-meansquare speed of molecules at this temperature. (Atomic mass of nitrogen = 14.0076

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

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The following table gives the values of work functions for a few sensitive metals. S. No. Metal Work function(eV) 1 Na 1.92 2 K 2.15 3 Mo 4.17 If each of these metals is exposed to radiations of wavelength 3300nm, which of these will not exit photoelectrons and

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

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Define threshold wavelength for photoelectric effect? Debroglie wavelength associated with an electron associated through a potential difference V isλ ? What will be the new wavelength when the accelerating potential is increase to

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

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An electron has kinetic energy equal to 100eV. Calculate (1) momentum (2) speed (3) Debroglie wavelength of the

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

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(a) Define photoelectric work function? What is its unit?(b) In a plot of photoelectric current versus anode potential, how does(i) Saturation current varies with anode potential for incident radiations of different frequencies but same intensity?(ii) The stopping potential varies for incident radiations of different intensities but same frequency.(iii) Photoelectric current vary for different intensities but same frequency of radiations? Justify your answer in each

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

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Photoelectric work function of a metal is 1eV. Light of wavelength `3000A^o` falls on it. What is the velocity of the effected

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

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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

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

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Draw a graph showing the variation of stopping potential with frequency of the incident radiations. What does the slope of the line with the frequency axis indicate. Hence define threshold

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

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Show does the force between two point charges change if the dielectric constant of the medium in which they are kept

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 released form rest in a uniform electric field of intensity E. calculate the kinetic energy it attains after moving a distance s between the

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

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Two point charges +q and +9q are separated by a distance of 10 a. Find the point on the line joining the two changes where electric field is

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

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Define the term dipole moment `vecP` of an electric dipole indicating its direction. Write its S.I unit. An electric dipole is placed in a uniform electric field `vecE` . Deduce the expression for the Torque acting on

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

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A sphere of radius `r_1` encloses a change Q. If there is another concentric sphere S2 of radius `r_2 (r_2 > r_1)` and there is no additional change between S1 and S2. Find the ratio of electric flux through S1 and

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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Two point electric charges of value q and 2q are kept at a distance d apart from each other in air. A third charge Q is to be kept along the same line in such a way that the net force acting on q and 2q is zero. Calculate the position of charge Q in terms of q and

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

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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 =

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

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Prove that the energy stored in a parallel plate capaSScitor is given by ½ `CV^2`

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

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State Gauss’s Theorem in electrostatics? Using this theorem define an expression for the field intensity due to an infinite plane sheet of change of charge density σ C/`m^2`

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

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Derive an expression for the total work done in rotating an electric dipole through an angle θ in a uniform electric

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

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