Q. The ratio of intensities of two waves is 9:1. They are producing interference. The ratio of maximum and minimum intensities will be
A) 10 : 8
B) 9 : 1
C) 4 : 1
D) 2 : 1
Explanation
(c) $\frac{I_{\max}}{I_{\min}} = \left( \frac{\sqrt{\frac{I_{1}}{I_{2}}} + 1}{\sqrt{\frac{I_{1}}{I_{2}}} - 1} \right)^{2} = \left( \frac{\sqrt{\frac{9}{1}} + 1}{\sqrt{\frac{9}{1}} - 1} \right)^{2} = \frac{4}{1}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.