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(D) Coherent sources are defined as sources that emit waves of the same frequency and maintain a constant phase difference over time.Since the speed o

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Both $(b)$ and $(c)$

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(D) Coherent sources are defined as sources that emit waves of the same frequency and maintain a constant phase difference over time.Since the speed of a wave $v$ is related to its wavelength $\lambda$ and frequency $f$ by the equation $v = f \lambda$,if two waves have the same wavelength and frequency,they must have the same phase velocity.In many contexts,the terms wavelength,frequency,and phase velocity are used to describe the characteristics of coherent sources.Therefore,both options $(b)$ and $(c)$ describe the necessary conditions for coherence in standard wave physics.Thus,the correct option is $(d)$.

Coherent sources are characterized by the same

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