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CGP EDU Academic Team
Published on: September 12, 2026
Two sound waves (expressed in CGS units) given by $y_1 = 0.3 \sin \frac{2 \pi}{\lambda} (vt - x)$ and $y_2 = 0.4 \sin \frac{2 \pi}{\lambda} (vt - x + \theta)$ interfere. The resultant amplitude at a place where phase difference is $\pi/2$ will be
Text Solution
Verified by ExpertsThe correct answer is:
C
Resultant amplitude = $\sqrt{a_1^2 + a_2^2 + 2a_1 a_2 \cos \varphi}$
= $\sqrt{0.3^{2} + 0.4^{2} + 2 \times 0.3 \times 0.4 \times \cos \frac{\pi}{2}}$ = 0.5 cm
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