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Relationship between λ and max kinetic energy

  1. Oct 3, 2014 #1
    1. The problem statement, all variables and given/known data
    When lights falls on metal suface , electrons are emitted if the wavelength of light is less than or equal to λ , .If lights of 0.5λ is used , then maximum kinetic energy of electrons is E . if lights of 0.25λ is used , what's the maximum kinetic energy of the electron emitted?
    the ans is 3E... why?
    2. Relevant equations


    3. The attempt at a solution
    since E is inversely propotional to λ , so my ans is 2E ....
     
  2. jcsd
  3. Oct 4, 2014 #2

    NascentOxygen

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    Staff: Mentor

    3E is correct. Show your working in full.

    Note carefully that E is defined as max KE at a particular λ .
     
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