A detector at `x=0` receives waves from three sources each of amplitude `A` and frequencies `f + 2,f` and `f-2`.
The time at which intensity is maximum, is

Options

A. `t=0,1//4,1//2,3//4,…sec`
B. `t=1//6,1//3,2//3,5//6,…sec`
C. `t=0,1//2,3//2,5//2,..sec`
D. `t=1//2,1//4,1//6,1//8,…sec`

Answer

A

Explanation

`sin 4pi t=0rArr t=(n)/(4) :. t=0,(1)/(4),(1)/(2),(3)/(4)....` (point of maximum intensity).