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GS Exam 1 PS 20 Freq. and Wavelength Question

Discussion in 'MCAT Study Question Q&A' started by thomasfx10, Aug 14, 2011.

  1. thomasfx10

    thomasfx10 Medical Student
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    My question is about the relationship to Wavelength, Velocity and Freq.

    It was my impression that they are related via the equation:

    Freq = Velocity / Wavelength.

    However, according to their answer there is not a relationship. What am I missing? Thanks!




    20) Which of the following would you expect to remain constant when light travels from one medium to another and the media differ in their refractive indices?

    A) Velocity
    B) Frequency
    C) Wavelength
    D) Intensity

    INCORRECT:
    Your Answer: D
    Correct Answer: B
    Explanation Discuss this question

    From the passage, both velocity and wavelength (different colors) change (P2; recall velocity and wavelength are directly proportional, PHY 7.1.2). One should also know that the intensity (= the rate of energy propagation through space, PHY 8.3) of a light ray decreases when it passes through a medium other than air (its velocity decreases in the medium and this leads to an overall loss of energy).
     
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  2. kehlsh

    kehlsh Medic Commando
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    it's like capacitance where formula is C = Q/V but C doesn't go up as Q increases, rather V just increases along with it to make constant C

    C can be on the other hand, changed by C = eA/d formula

    in here, the freq NEVER change when the waves go to diff media, just the wavelength and velocity. (only exception is probably dispersion in prism)
     
  3. OP
    OP
    thomasfx10

    thomasfx10 Medical Student
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    Wow ... that is good to know! Thanks
     
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