Two waves are represented by the equations y1=asinωt and y2=acosωt.The first wave

Two waves are represented by the equations $y_{1} = a \sin ω t$ and $y_{2} = a \cos ω t .$
The first wave

A
Leads the second by p
B
Lags the second by p
C
Leads the second by $\frac{π}{2}$
D
Lags the second by $\frac{π}{2}$

Solution:

$y_{1} = a \sin ω t, y_{2} = a \cos ω t = a \sin (ω t + \frac{π}{2})$

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