Q. Two point sources $X$ and $Y$ emit waves of same frequency and speed but $Y$ lags in phase behind $X$ by $2\pi l$ radian. If there is a maximum in direction $D$ the distance $XO$ using in as an integer is given by
A) $\frac{\lambda}{2}(n - l)$
B) $\lambda(n + l)$
C) $\frac{\lambda}{2}(n + l)$
D) $\lambda(n - l)$
Explanation
(b) For maxima $2\pi n = \frac{2\pi}{\lambda}(XO) - 2\pi l$
Or $\frac{2\pi}{\lambda}(XO) = 2\pi(n + l)$ or $(XO) = \lambda(n + l)$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.