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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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Calculate the threshold frequency of photon for photoelectric emission from a metal of work function

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

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Ultraviolet light is incident on two photosensitive materials having work function `φ_1 and φ_2 (φ_1 > φ_2 )`. In which of the case will K.E. of emitted electrons be greater?

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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Obtain the expression for the maximum kinetic energy of the electrons emitted from a metal surface in terms of the frequency of the incident radiation and the threshold

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

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For a given K.E. which of the following has the smallest de–broglie wavelength: electron, proton, α − particle

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

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Photoelectrons are emitted with a maximum speed of `7×10^5m`/`s` from a surface when light of frequency `8×10^(14)Hz` is incident on it. Find the threshold frequency for this

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

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Is photoelectric emission possible at all frequencies? Give reason for your

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

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Assume that the frequency of the radiation incident on a metal plate is greater than its threshold frequency. How will the following change, if the incident radiation is doubled?(1) Kinetic energy of electrons (2) Photoelectric

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

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Why are de – broglie waves associated with a moving football is not

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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How does the stopping potential applied to a photocell change if the distance between the light source and the cathode of the cell is

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

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On what factor does the retarding potential of a photocell

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

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

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

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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 by varun (6.7k points)

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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 by varun (6.7k points)

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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 by varun (6.7k points)

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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 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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