Definition of coherent sources

In summary, coherent sources refer to two or more sources of waves with a constant phase difference and the same frequency and wavelength. Coherence is important in wave sources as it allows for the production of interference patterns and enables the use of techniques like holography and interferometry. Coherence can be measured using methods such as the Michelson interferometer and Young's double-slit experiment. Examples of coherent sources include laser beams, sound waves from a single musical instrument, and radio waves from a single antenna. The coherence of sources directly affects the interference pattern produced, with perfectly coherent sources producing distinct patterns and less coherent sources producing less defined patterns.
  • #1
Amith2006
427
2
Sir,
Coherent sources are defined as sources having same frequency and constant phase difference. In some books it is given that coherent sources have constant phase difference only. Which is correct?
 
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  • #2
If two waves had different frequencies would they have a constant phase difference?

~H
 
  • #3
Constant phase difference will do as this in effect would mean that the sources possesses the same frequency.
But the reverse is not applicable.
Frequency can remain same with varying phase difference over time .
 

What is the definition of coherent sources?

The definition of coherent sources refers to two or more sources of waves that have a constant phase difference and emit waves with the same frequency and wavelength.

Why is coherence important in wave sources?

Coherence is important in wave sources because it allows for the production of interference patterns, which can be used to study and understand wave behavior. It also enables the use of techniques such as holography and interferometry.

How can coherence be measured in wave sources?

Coherence can be measured using a variety of methods, including the Michelson interferometer, Young's double-slit experiment, and the visibility function. These techniques compare the phase and amplitude of waves from different sources to determine their coherence.

What are some examples of coherent sources?

Examples of coherent sources include laser beams, sound waves from a single musical instrument, and radio waves emitted from a single antenna. Other examples include waves produced by a single atom or molecule, and waves emitted from a single point source.

How does the coherence of sources affect the interference pattern produced?

The coherence of sources directly affects the interference pattern produced. If the sources are perfectly coherent, the pattern will be stable and have distinct bright and dark fringes. However, if the sources are not coherent, the pattern will be less defined and may even appear random.

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