COMEDK · Physics · 16. Waves and Sound
In an interference pattern the ratio of the intensity of light at the bright fringe to that at the dark fringe is \(9: 1\). Then, the ratio of the amplitudes of the two interfering waves
- A \(3: 1\)
- B \(2: 1\)
- C \(1: 4\)
- D \(5: 4\)
Answer & Solution
Correct Answer
(B) \(2: 1\)
Step-by-step Solution
Detailed explanation
Given, \(\frac{I_{\max }}{I_{\min }}=9\) Since, intensity \(\propto(\text { amplitude })^{2}\) \(\therefore \quad \frac{A_{\max }}{A_{\min }}=\frac{a_{1}+a_{2}}{a_{1}-a_{2}}=\sqrt{\frac{9}{1}}=\frac{3}{1}\) \(\Rightarrow \quad a_{1}+a_{2}=3 a_{1}-3 a_{2}\)…
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