Sound WavesHard

Question

Two wave are represented by equation y1 = a sin ωt and y2 = a cos ωt the first wave : -

Options

A.leads the second by
B.lags the second by π
C.leads the second by
D.lags the second by

Solution

y1 = a sin ωt
y2 = a cos ωt = a sin (ωt + π/2)
y1 lags y2 behind by phase

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