Electromagnetic Waves Frequency

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Discussion Overview

The discussion revolves around the properties of electromagnetic waves, specifically focusing on frequency, amplitude, and wavelength. Participants explore the definitions and implications of these concepts in the context of electromagnetic radiation.

Discussion Character

  • Conceptual clarification, Technical explanation

Main Points Raised

  • One participant notes that electromagnetic radiation involves periodic variations of the electric field, questioning if frequency indicates how quickly these fields change.
  • Another participant confirms that a frequency of 1Hz corresponds to one complete cycle of oscillation per second, explaining the relationship between frequency and the time taken for a complete cycle.
  • A participant inquires about the amplitude, asking if it represents the maximum magnitude of the electric field, which is affirmed by another participant.
  • The same participant expresses confusion about the meaning of wavelength, leading to a clarification that it represents the distance along the wave's direction between points of maximum or minimum magnitude.

Areas of Agreement / Disagreement

Participants generally agree on the definitions of frequency and amplitude, while there is a shared inquiry into the meaning of wavelength, indicating some uncertainty remains.

Contextual Notes

The discussion does not address potential limitations or assumptions regarding the definitions of these terms or their interrelationships.

sarvesh0303
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I was watching the lectures on the MIT OCW course 5.111 where it was said that electromagnetic radiations are periodic variations of the electric field. Does it mean that when we are talking about electromagnetic radiation, frequency indicates how quickly do the electric fields change(their direction and magnitude).
 
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Yes - a frequency of 1Hz means that there is one cycle of oscillation of the fields per second. A cycle is the period during which an oscillation goes through a complete range of values - up, down and back to the beginning. Frequency is 1/(time taken for one complete cycle). That goes for all forms of oscillation btw.
 
Thanks . And does amplitude represent the maximum magnitude the electric field can reach? What really puzzles me is what the wavelength represents in this case.
 
sarvesh0303 said:
And does amplitude represent the maximum magnitude the electric field can reach?

Yes.

What really puzzles me is what the wavelength represents in this case.

It's the distance along the direction that the wave is traveling, between two points of maximum magnitude, or between two points of minimum magnitude.
 
Thanks a lot guys!
 

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