What does coherent exactly mean?

In summary, the conversation discusses the concept of coherence, specifically in regards to light and water waves. Coherent light refers to photons being in phase and creating constructive interference, while coherent water waves remain orderly and do not scatter. Coherence is important for creating interference and is the basis of a laser. There are two types of coherence - spatial and time-like.
  • #1
primarygun
233
0
What does coherent exactly mean? What does same phase difference refer to?
Why these two factors must be present so as to create interference?
I'd think if a wave which has a half wavelength to another, same speed.
the phenomenon can be observed clearly too.
 
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  • #3
https://www.physicsforums.com/journal.php?s=&action=view&journalid=13790&perpage=10&page=9

Check out the 'for microelectrinics and nanotechnology lovers' entry


There are two types of coherency : spatial and time-like coherence. For example let's look at a wave that consists out of two subwaves. If you would look at some point on each subwave, you will see that the distances between those two points (one point on each subwave) does not alter when the wave propagates through space and time. One subwave does not run away from the other subwave, they stay together. This kind of wave is very ordened and no subwave will scatter off.

marlon
 
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  • #4
Thank you.
So water wave is really different from light wave as a light wave contain many incoherent small wave but water wave does not contain?
 

1. What does the term "coherent" mean in science?

The term "coherent" in science refers to a state in which different parts of a system or experiment are connected and work together in a smooth and organized manner. It can also refer to the logical consistency and clarity of an argument or theory.

2. How does coherence relate to the scientific method?

Coherence is an important aspect of the scientific method as it ensures that all data and evidence are consistent with each other and support a particular conclusion or hypothesis. It helps scientists to make logical and reliable conclusions based on their research.

3. Can you provide an example of coherence in science?

One example of coherence in science is in the field of physics, where the concept of coherence is used to describe the synchronization of waves. When two or more waves are coherent, their peaks and troughs align and amplify each other, resulting in a stronger and more organized wave.

4. What is the difference between coherence and consistency in science?

While coherence refers to the interconnectedness and logical consistency of different parts of a system or argument, consistency refers to the repeatability and reliability of results or data. In other words, coherence focuses on the internal relationships, while consistency focuses on the external validation of a scientific explanation.

5. How is coherence important in scientific communication?

Coherence is crucial in scientific communication as it allows researchers to present their findings in a clear and organized manner, making it easier for other scientists to understand and replicate their work. It also helps to avoid misunderstandings and ensures that the information is accurately conveyed to the audience.

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