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I Wave Frequency in a Medium

  1. Mar 12, 2017 #1
    Hi I was told by physics lecturer that both the wave speed and wave length of light changes when it enters a medium, however I questioned this stating that if both wave speed and wave length changed then frequency must also according to the formula c = fλ. He stated that "frequency is energy and energy is conserved"

    I was wondering if I would be able to get a more in depth answer from someone here and correct my lecturers statement.
  2. jcsd
  3. Mar 12, 2017 #2


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    No joy: teacher is right. You can convince yourself easily if you think of the conditions at the interface. If the one 'vibrates' at a certain frequency, then the other won't 'vibrate' at a different frequency
  4. Mar 12, 2017 #3


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    @Theud try rearranging your formula and fix the frequency so f = c/λ .... you can have any number of variations of c and λ and have the same frequency

    Last edited: Mar 13, 2017
  5. Mar 12, 2017 #4
    You mean the same frequency.
  6. Mar 13, 2017 #5


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    oops corrected :rolleyes:
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