KCET · Physics · Wave Optics
Two sources are said to be coherent if they produce waves
- A having a constant phase difference
- B of equal wavelength
- C of equal speed
- D having same shape of wavefront
Answer & Solution
Correct Answer
(A) having a constant phase difference
Step-by-step Solution
Detailed explanation
Phase difference \(=\frac{2 \pi}{\lambda} \times\) (path difference)
The phase difference is independent of time and depends only on the path difference \(\left(x_{2}-x_{1}\right)\). This holds only if the two sources are 'coherent', ie, they have a constant fixed phase difference between them.
The phase difference is independent of time and depends only on the path difference \(\left(x_{2}-x_{1}\right)\). This holds only if the two sources are 'coherent', ie, they have a constant fixed phase difference between them.
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