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Question

For the pressure variation in a longitudinal wave represented as P=Pocos(ωtkx), the density (ρ) equation for the given medium is best represented by
(ρo is the density of the medium at pressure Po)

A
ρ=ρosin(ωtkx)
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B
ρ=ρosin(ωtkx)
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C
ρ=ρocos(ωtkx)
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D
ρ=ρocos(ωtkx)
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