Out of the given four waves (1), (2), (3) and (4).
$y=a\sin (kx+\omega t)$ ......(1)
$y=a\sin (\omega t-kx)$ ......(2)
$y=a\cos (kx+\omega t)$ ......(3)
$y=a\cos (\omega t-kx)$ ......(4)
emitted by four different sources ${{S}_{1}},\,{{S}_{2}},\,{{S}_{3}}$ and ${{S}_{4}}$ respectively, interference phenomena would be observed in space under appropriate conditions when

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Accepted Answer

Source ${{S}_{2}}$ emits wave (2) and ${{S}_{4}}$ emits wave (4)

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Source ${{S}_{1}}$ emits wave (1) and ${{S}_{2}}$ emits wave (2)

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Source ${{S}_{3}}$ emits wave (3) and ${{S}_{4}}$ emits wave (4)

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${{S}_{4}}$ emits waves (4) and ${{S}_{3}}$ emits waves (3)

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