First slide

Superposition of waves

Question

Coherent sources are characterized by the same

Easy

A

Phase and phase velocity
B

Wavelength, amplitude and phase velocity
C

Wavelength, amplitude and frequency
D

Wavelength and phase

Solution

Because in general phase velocity = wave velocity. But in case of complex waves (many waves together) phase velocity $\neq$ wave velocity.
$∴$ If two waves have same $λ, v;$ then they have same frequency too

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