Questions by varun

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Electron and proton are moving with same speed, which will have more

asked Mar 20, 2022 in 12th Physics

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By how much would the stopping potential for a given photosensitive surface goup if the frequency of the incident radiations were to be increased from `4×10^(15) Hz` to `8 × 10^(15) Hz? ` `(h=6.4xx10^(-3)4Js,

asked Mar 20, 2022 in 12th Physics

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Work function of Na is 2.3eV. Does sodium show photoelectric emission for light on the velocity of

asked Mar 20, 2022 in 12th Physics

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An electron and an alpha particle have the same debroglie wavelength associated with them? How are their kinetic energies related to each

asked Mar 20, 2022 in 12th Physics

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An α − particle and a proton are accelerated from rest through same potential difference V. find the ratio of de–broglie wavelength associated with

asked Mar 20, 2022 in 12th Physics

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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

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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

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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

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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

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A charged rod P attracts rod R where as P repels another charged rod Q. What type of force is developed between Q and

asked Mar 20, 2022 in 12th Physics

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A free proton and a free electron are placed in a uniform field. Which of the two experience greater force and greater

asked Mar 20, 2022 in 12th Physics

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No two electric lines of force can intersect each other?

asked Mar 20, 2022 in 12th Physics

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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

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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

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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

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(1) The electric field `vecE` due to a point change at any point near to it is defined as: `vecE=Lim vecF/q`where q is the test charge and `vecF` is the force acting on it. What is the significance of lim `qtoo` in this expression?(2) Two charges each `2 xx 10^(-7)` C but opposite in sign forms a system. These charges are located at points A (0,0, -10) cm and B(0,0, +10) cm respectively. What is the total charge and electric dipole moment of the

asked Mar 20, 2022 in 12th Physics

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(a) Sketch electric lines of force due to (i) isolated positive change (ie q>0) and(ii) isolated negative change ( ie q(b) Two point changes q and –q are placed at a distance 2a apart. Calculate the electric field at a point P situated at a distance r along the perpendicular bisector of the line joining the charges. What is the field when r >>

asked Mar 20, 2022 in 12th Physics

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Which physical quantity has its S.I unit (1) Cm (2)

asked Mar 20, 2022 in 12th Physics

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asked Mar 20, 2022 in 12th Physics

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The graph shows the variation of voltage V across the plates of two capacitors A and B versus increase of charge Q stored on them. Which of the two capacitors have higher capacitance? Give reason for your answer?

asked Mar 20, 2022 in 12th Physics

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