Four harmonic waves of equal freuencies and equal intensity `I_(0)` have phase angles `0, (pi)/(3), (2pi)/(3)` and `pi`. When they are superposed, the intensity of the resulting wave is `nI_(0)`. The value of `n` is

Answer

3

Explanation

Restaurant amplitude `A=2A_0 cos 30^(@)=A_0sqrt3`
As `I prop A^(2) therefore ` Resultant intensity`=3L_0`