Question

Three waves of equal frequency having amplitudes `10mum`, `4mum`, `7mum` arrive at a given point with successive phase difference of `pi//2`, the amplitude of the resulting wave in `mum` is given by
A. 4
B. 5
C. 6
D. 7

Answer 1

Correct Answer - B

Resultant amplitude `A=sqrt((3)^(2)+(4)^(2))=5 mum`