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Waves — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysicsWaves1 Mark
Question
What is the phase difference between the waves $\text{y}=\text{a}\cos(\omega\text{t}+\text{kx})$ and $\text{y}=\text{a}\sin (\omega\text{t}+\text{kx})?$
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Answer

Phase difference $=\frac{\pi}{2}=90^\circ.$

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