MCQ
Two waves ${y_1} = {A_1}\sin (\omega t - {\beta _1})$, ${y_2} = {A_2}\sin (\omega t - {\beta _2})$ Superimpose to form a resultant wave whose amplitude is
- ✓$\sqrt {A_1^2 + A_2^2 + 2{A_1}{A_2}\cos ({\beta _1} - {\beta _2})} $
- B$\sqrt {A_1^2 + A_2^2 + 2{A_1}{A_2}\sin ({\beta _1} - {\beta _2})} $
- C${A_1} + {A_2}$
- D$|{A_1} + {A_2}|$
