12th Class Physics Photo Electric Effect, X- Rays & Matter Waves

  • question_answer 46)
          Relativistic corrections become necessary      when the expression for the kinetic energy , becomes comparable with mc2, where m is the mass of the particle. At what de Broglie wavelength will relativistic corrections become important for an electron? (a)                      (b) (c)                    (d)

    Answer:

       (c,d)Velocity of electron, Let     and  (a) When        (b)When  (c)When (d) When As  and  are greater than velocity of light (= 3 x 108 m/s), hence relativistic correction is needed for nm and  nm. Thus, options (c) and (d) are required wavelengths.


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