Question

The resultant amplitude in interference with two coherent sources depends upon-

• A. Intensity
• B. Only phase difference
• C. On both the above
• D. None of the above

Answer 1

The correct option is C On both the above

The resultant amplitude of interference is,

$R=\sqrt{a_1^2+a_2^2+2a_1{a}_2\cos \varphi }$

Where, $a_1\&a_2\to \text{Amplitudes of the two independent coherent sources}\cos \varphi \to \text{Phase difference}$

Whereas the intensity is given by,

$I=K(\text{Amplitude}{)}^2$

$\therefore$ Amplitude depends upon intensity and phase difference.

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Hence, $\left(C\right)$ is the correct answer.