Exploring the Coherence Length and Repeat Length in Wave Packets

AI Thread Summary
The discussion centers on the confusion regarding the term "repeat length" in relation to wave packets, which are not periodic and do not have a consistent repeat length due to their varying peak heights. Participants suggest that the repeat length could be interpreted as infinite, reflecting the non-repeating nature of wave packets. A more cautious interpretation proposes that if the coherence length is sufficiently long, the repeat length may correspond to the mean wavelength within the wave packet's spread. Clarification is sought on the correct understanding of these concepts. The conversation highlights the complexities of wave packet behavior in physics.
zarrin77
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It says on my homework that:
"A wave packet is like a periodic function with a repeat length of _______."

I am confused by "repeat length" because I understand a wave packet to NOT repeat anywhere. It has a spread x but the peaks are all different heights, so I do not really understand what they are asking?

Your suggestions are very appreciated =)
 
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If you really believe what you say and have no fear, put this:

"A wave packet is like a periodic function with a repeat length of infinity."

That sentence is very audacious!

The safe answer would probably go something like, "assuming the coherence length to be sufficiently long, the repeat length is the mean wavelength in the spread" (at least I think that's right - someone do correct me if I'm wrong!).
 

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