Question

Three waves of equal frequency having amplitudes 10mm, 4mm and 7mm arrive at a given point with successive phase difference $\pi /2$ . The amplitude of the resulting wave in mm is given by

• A. 7
• B. 6
• C. 5
• D. 4

Answer 1

Answer: (C)

$a_{res}=\sqrt{a_1^2+(a_2-a_3{)}^2}$