Two waves are represented by ${y_1} = a\sin \left( {\omega \,t + \frac{\pi }{6}} \right)$ and ${y_2} = a\cos \omega \,t$. What will be their resultant amplitude
  • A$a$
  • B$\sqrt 2 \,a$
  • C$\sqrt 3 \,a$
  • D$2a$
Easy
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