it the two waves represented dy `y_(1)=4cos omegat` and `y_(2)=3 cos(omegat+pi//3)` interfere at a point, then the amplitude of the resulting wave wil
it the two waves represented dy `y_(1)=4cos omegat` and `y_(2)=3 cos(omegat+pi//3)` interfere at a point, then the amplitude of the resulting wave will be about
A. 7
B. 5
C. 6
D. `3.5`
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Correct Answer - C
Given, `phi=pi/3`
`A=sqrt(A_(1)^(2)+A_(2)^(2)+2A_(1)A_(2)cosphi)`
`=sqrt(16+9+2(4)(3)cos 60^(@))approx sqrt(36)=6`
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