Question

Two waves are said to coherent ,if they have....

Answer 1

Wave coherence occurs when two or more wave sources generate waves at thesame time, having the same frequency, amplitude, and phase. Coherent waves can also be described as "synchronous." ... Waves are considered incoherent or asynchronous if they have no stable phase relationship 

Answer 2

Two waves are said to coherent ,if they have constant phase.

Explanation:

• Coherence is all about the constant phase connection; the stage variance could be whatsoever, such as π or $\frac{7\pi }{4}$Simply, that means that two waves are coherent if and only if they have the similar frequency, which styles the impression of coherence sound silly.
• Phase refers to the relationship of two sine waves (signals) to each other. If both signals are at their highest peak (+) at the same time they are in phase.
• If one signal is at its highest peak (+) while the other signal is at its lowest peak (-) they are 180 degrees out of phase.

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