In Fig 35-54, two isotropic point sources ${\mathit{S}}_{\mathbf{1}}$and ${\mathit{S}}_{\mathbf{2}}$emit light at wavelength $\mathit{\lambda }\mathbf{=}\mathbf{400}\mathbf{}\mathbf{nm}$. Source ${\mathit{S}}_{\mathbf{1}}$is located at $\mathit{y}\mathbf{=}\mathbf{640}\mathbf{}\mathbf{nm}$, source ${\mathit{S}}_{\mathbf{2}}$is located at $\mathit{y}\mathbf{=}\mathbf{-}\mathbf{640}\mathbf{}\mathbf{nm}$. At point ${\mathit{P}}_{\mathbf{1}}$(at $\mathit{x}\mathbf{=}\mathbf{720}\mathbf{}\mathbf{nm}$), the wave from ${\mathit{S}}_{\mathbf{2}}$arrives ahead of the wave from ${\mathit{S}}_{\mathbf{1}}$by a phase difference of $\mathbf{0}\mathbf{.}\mathbf{600}\mathbf{\pi }$rad. (a) What multiple of $\mathit{\lambda }$gives the phase difference between the waves from the two sources as the waves from the two sources as the waves arrive at point ${\mathit{P}}_{\mathbf{2}}$, which is located at $\mathit{y}\mathbf{=}\mathbf{720}\mathbf{}\mathbf{nm}$? (The figure is not drawn to scale) (b) If the waves arrive at ${\mathit{P}}_{\mathbf{2}}$with equal amplitudes, is the interference there fully constructive, fully destructive, intermediate but closer to fully destructive, intermediate but closer to fully destructive?

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