Question

If two waves of intensities $I$ and $4I$ superpose, the ratio between maximum and minimum intensities is

• A. $9:1$
• B. $5:2$
• C. $4:3$
• D. $3:1$
• E. $6:1$

Answer 1

Answer: (A)

$\frac{I_{\max }}{I_{\min }}={\left(\frac{\sqrt{I_1}+\sqrt{I_2}}{\sqrt{I_1}-\sqrt{I_2}}\right)}^2=\frac{9}{1}$