Does Frequency Change in a Medium?

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Discussion Overview

The discussion revolves around the behavior of light waves as they enter different media, specifically addressing how wave speed, wavelength, and frequency are related. Participants explore the implications of the formula c = fλ in the context of changing conditions at the interface of media.

Discussion Character

  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • One participant questions their lecturer's assertion that frequency is conserved when light enters a medium, suggesting that changes in wave speed and wavelength imply a change in frequency.
  • Another participant supports the lecturer's view, arguing that the frequency of a wave remains constant at the interface between two media, as the wave cannot vibrate at different frequencies simultaneously.
  • A third participant suggests rearranging the formula to show that variations in wave speed and wavelength can occur while maintaining the same frequency.

Areas of Agreement / Disagreement

Participants express disagreement regarding the conservation of frequency when light transitions between media. Some support the lecturer's position, while others challenge it, indicating that the discussion remains unresolved.

Contextual Notes

The discussion highlights the dependence on the definitions of wave properties and the conditions at the interface, which may not be fully explored or agreed upon by participants.

Theudius
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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.
 
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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
 
Theudius said:
however I questioned this stating that if both wave speed and wave length changed then frequency must also according to the formula c = fλ.

BvU said:
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

indeed

@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

Dave
 
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You mean the same frequency.
 
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pixel said:
You mean the same frequency.

oops corrected :rolleyes:
 

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