Question

If the ratio of maximum and maximum Intensities tn an interference pattern is 36: 1 then the ratio of amplitudes of two Interfering waves Will be

• A. 5 :7
• B. 7 :4
• C. 4 :7
• D. 7 :5

Answer 1

The correct option is D 7 :5

$\frac{I_{max}}{I_{min}}=\left(\frac{\frac{a_1}{a_2}+1}{\frac{a_1}{a_2}-1}\right)$

$\Rightarrow \frac{a_1+a_2}{a_1-a_2}=6\frac{a_2}{a_1}=7:5$

Hence,

option $\left(D\right)$ is correct answer.