Q .     Two waves `y_(1) = A_(1) sin (omegat- beta _(1))` and
`y_(2) = A_(2) sin(omega t - beta_(2) )` superimpose to form a
resultant wave whose amplitude is

VIT 2013
A

`A_(1) + A_( 2)`

B

`|A_(1) + A_( 2)|`

C

`sqrt(A_(1)^(2) + A_(2)^(2) +2A_(1)A_(2) sin(beta_(1) - beta_(2))`

D

`sqrt(A_(1)^(2) + A_(2)^(2) +2A_(1)A_(2) cos(beta_(1) - beta_(2))`

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