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).