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The intensities of two sources areIa nd ...

The intensities of two sources are`I`a nd `9I` respectively,If the phase difference between the waves emitted by then is `pi`then the resultant intensity at the point of observation will be-

A

`3I`

B

`4I`

C

`10I`

D

`82I`

Text Solution

Verified by Experts

`I'=I_(1)+I_(2)+2sqrt(I_(1)_I_(2)cos(phi))`
`I_(1)=I,I_(2)=9I,phi=pi`
`I'=I+9I+2sqrt(9I^(2))cospi=10I-6I=4I`
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